• "'I don't know what to do!'"
    "'I don't know what to do!'"
  • WordNet 3.6
    • v know accept (someone) to be what is claimed or accept his power and authority "The Crown Prince was acknowledged as the true heir to the throne","We do not recognize your gods"
    • v know be familiar or acquainted with a person or an object "She doesn't know this composer","Do you know my sister?","We know this movie","I know him under a different name","This flower is known as a Peruvian Lily"
    • v know be cognizant or aware of a fact or a specific piece of information; possess knowledge or information about "I know that the President lied to the people","I want to know who is winning the game!","I know it's time"
    • v know be aware of the truth of something; have a belief or faith in something; regard as true beyond any doubt "I know that I left the key on the table","Galileo knew that the earth moves around the sun"
    • v know know how to do or perform something "She knows how to knit","Does your husband know how to cook?"
    • v know have fixed in the mind "I know Latin","This student knows her irregular verbs","Do you know the poem well enough to recite it?"
    • v know have firsthand knowledge of states, situations, emotions, or sensations "I know the feeling!","have you ever known hunger?","I have lived a kind of hell when I was a drug addict","The holocaust survivors have lived a nightmare","I lived through two divorces"
    • v know perceive as familiar "I know this voice!"
    • v know be able to distinguish, recognize as being different "The child knows right from wrong"
    • v know know the nature or character of "we all knew her as a big show-off"
    • v know have sexual intercourse with "This student sleeps with everyone in her dorm","Adam knew Eve","Were you ever intimate with this man?"
    • n know the fact of being aware of information that is known to few people "he is always in the know"
    • ***

Additional illustrations & photos:

I believe they wuz conscience-smut, but I don't know I believe they wuz conscience-smut, but I don't know
"I'm a-goin' to buy that little picter, and I want to know if I can take it home now?" "I'm a-goin' to buy that little picter, and I want to know if I can take it home now?"
i Know You, Unt What You're Here For.' 32 i Know You, Unt What You're Here For.' 32
Dond you know der rule of der river Dond you know der rule of der river
Do you know these balls cost five guineas each Do you know these balls cost five guineas each
Are you sure you know what kind of cap you do want Are you sure you know what kind of cap you do want
I don't know if you're acquainted with a paper called the Penny Patrician? I don't know if you're acquainted with a paper called the Penny Patrician?

Webster's Revised Unabridged Dictionary
  • Interesting fact: Only 55 percent of all Americans know that the sun is a star
    • n Know Knee.
    • Know To be acquainted with; to be no stranger to; to be more or less familiar with the person, character, etc., of; to possess experience of; as, to know an author; to know the rules of an organization. "He hath made him to be sin for us, who knew no sin.""Not to know me argues yourselves unknown."
    • Know To be assured; to feel confident.
    • Know To be convinced of the truth of; to be fully assured of; as, to know things from information.
    • Know To have knowledge; to have a clear and certain perception; to possess wisdom, instruction, or information; -- often with of. "Israel doth not know , my people doth not consider.""If any man will do his will, he shall know of the doctrine, whether it be of God, or whether I speak of myself.""The peasant folklore of Europe still knows of willows that bleed and weep and speak when hewn."
    • Know To have sexual intercourse with. "And Adam knew Eve his wife.""And I knew that thou hearest me always.""The monk he instantly knew to be the prior.""In other hands I have known money do good."
    • Know To perceive or apprehend clearly and certainly; to understand; to have full information of; as, to know one's duty. "O, that a man might know The end of this day's business ere it come!""There is a certainty in the proposition, and we know it.""Know how sublime a thing it is
      To suffer and be strong."
    • Know To recognize; to distinguish; to discern the character of; as, to know a person's face or figure. "Ye shall know them by their fruits.""And their eyes were opened, and they knew him.""To know
      Faithful friend from flattering foe."
      "At nearer view he thought he knew the dead."
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: No one knows where Mozart is buried.
    • know To Perceive or understand as being fact or truth; have a clear or distinct perception or apprehension of; understand or comprehend clearly and fully; be conscious of perceiving truly.
    • know In a general sense, to have definite information or intelligence about; be acquainted with, either through the report of others or through personal ascertainment, observation, experience, or intercourse: as, to know American history; he knows the city thoroughly.
    • know To recognize after some absence or change; recall to the mind or perception; revive prior knowledge of: as, he was so changed that you would hardly know him.
    • know To recognize in contrast or comparison; distinguish by means of previous acquaintance or information: as, to know one man from another; we know a fixed star from a planet by its twinkling; to know the right way.
    • know To understand from experience or attainment; comprehend as to manner or method: with how before an infinitive: as, to know how to make something.
    • know To have sexual commerce with. Gen. iv. 1. [A euphemism.]
    • know To possess knowledge; be informed; have intelligence.
    • know To take cognizance; acquire knowledge; get intelligence.
    • know To be acquainted with each other. You and I have known, sir.
    • n know Knowledge.
    • n know A dialectal (Scotch) form of knoll
    • n know Middle English forms of knee.
    • ***
Chambers's Twentieth Century Dictionary
  • Interesting fact: No one knows why there is a 33 on a Rolling Rock bottle. The secret died with the original brewer.
    • v.t Know to be informed of: to be assured of: to be acquainted with: to recognise:
    • v.i Know to possess knowledge:—pr.p. knōw′ing; pa.t. knew (nū); pa.p. known (nōn)
    • n Know (Shak.) knowledge
    • adj Know completely ignorant
    • v.t Know (B.) to approve: to have sexual commerce with
    • ***


  • David Harold Fink
    David Harold Fink
    “Know what you want. Become your real self.”
  • Lauro Cavazos
    Lauro Cavazos
    “We must do better or perish as the nation we know today.”
  • Henry Wadsworth Longfellow
    “Know how sublime a thing it is to suffer and be strong.”
  • Welsh Proverb
    Welsh Proverb
    “A spoon does not know the taste of soup, nor a learned fool the taste of wisdom.”
  • Antoine De Saint-Exupery
    “I know but one freedom and that is the freedom of the mind.”
  • Linda Thomson
    Linda Thomson
    “Freedom is knowing who you really are.”


Better the devil you know - This is the shortened form of the full idiom, 'better the devil you know than the devil you don't', and means that it is often better to deal with someone or something you are familiar with and know, even if they are not ideal, than take a risk with an unknown person or thing.
Don't know whether to wind a watch or bark at the moon - If you don't know what to do, you don't know whether to wind a watch or bark at the moon.
Even the dogs in the street know - (Irish) This idiom is used frequently in Ireland, and means something is so obvious that even the dogs in the street know it.
He that travels far knows much - People who travel widely have a wide knowledge.
Heaven knows - If you ask someone a question and they say this, they have no idea.
Heaven only knows - The answer to a question is not or cannot be known. For example, heaven only knows when the war will end.
In the know - If you are in the know, you have access to all the information about something, which other people don't have.
Know a hawk from a handsaw - If someone knows a hawk from a handsaw, they are able to distinguish things and assess them.
Know full well - When you know full well, you are absolutely sure that you know.
Know the ropes - Someone who is experienced and knows how the system works know the ropes.
Know where all the bodies are buried - Someone who by virtue of holding a position of trust with an organization for a long period of time has come to know many of the secrets that others in more powerful positions would rather be kept secret knows where the bodies are buried. An implication is that the person knowing these secrets will use that knowledge to secure something of value for him- or herself.
Know which side one's bread is buttered on - If you know which side one's bread is buttered on, you know where your interests lie and will act accordingly to protect or further them.
Know which way the wind blows - This means that you should know how things are developing and be prepared for the future.
Know your onions - If someone is very well-informed about something, they know their onions.
Know your place - A person who knows their place doesn't try to impose themselves on others.


Webster's Revised Unabridged Dictionary
OE. knowen, knawen, AS. cnäwan,; akin to OHG. chnäan,in comp.), Icel. knä, to be able, Russ. znate, to know, L. gnoscere, noscere, Gr. gighw`skein, Skr. jnā,; fr. the root of E. can, (v. i.) ken,. √45. See Ken Can to be able, and cf. Acquaint Cognition Gnome Ignore Noble Note
Chambers's Twentieth Century Dictionary
A.S. cnáwan; Ice. kná, L. noscĕre for gnoscere, Gr. gignōskein.


In literature:

In that case her son must know it, and all the world must know it.
"Orley Farm" by Anthony Trollope
I only mean that neither letter nor picture are needed to prove what we're all wantin' to know, an' do know.
"The Death Shot" by Mayne Reid
I am not sure that he quite knows what he wants yet, but I think I know what is good for him.
"Janet's Love and Service" by Margaret M Robertson
I knowed she hadn't said a word to her pa, and I knowed I hadn't neither.
"The Man Next Door" by Emerson Hough
For myself, I have only arrived at the stage of knowing that I know next to nothing.
"Out in the Forty-Five" by Emily Sarah Holt
I know it must have been right, for you know everything about what is right to do on the sea.
"Blow The Man Down" by Holman Day
Well, I don't know so much about that part of it, but I do know about the buying and selling.
"The Day of Judgment" by Joseph Hocking
Well, you do know it now; and you know also how to act.
"Girls of the Forest" by L. T. Meade
We know ourselves and we know each other now as God knows us.
"The Creators" by May Sinclair
I know all your boxes so well, you know, so I can have no difficulty.
"The Bertrams" by Anthony Trollope

In poetry:

I will; I am come here
To stay with you—Festus, you loved of old;
Festus, you know, you must know!
"Paracelsus: Part V: Paracelsus Attains" by Robert Browning
For Thou art light and life and love;
And thy redeemed below
May see Thee as thy saints above,
And know Thee as they know.
"Father of light, and life, and love!" by James Montgomery
Ah! never, never may you know,
For little waves trip merrily;
And never, never may you know,
For sweet the little roses be.
"Congratulation" by Elizabeth Stuart Phelps Ward
Ask him if Aprile
Knows as he Loves—if I shall Love and Know?
I try; but that cold hand, like lead—so cold!
"Paracelsus: Part V: Paracelsus Attains" by Robert Browning
"I know your heart is warm and true,
Your love not cold or dumb,
No earthly power can it subdue;
I know that you will come."
"Fidelity" by Jared Barhite
Deep in my heart my sorrows lie,
And none the cause may know.
How can they know, who never try
To learn whence comes our woe?
"On The Misgovernment Of The State" by Confucius

In news:

What did Roger Clemens know, and when did he know it.
You might not know Deborah Lippmann's name, but you definitely know her work.
Steve Bernheim knows accessible outlets like a firefighter knows hydrants.
Anyone who knows me knows I am not a morning person.
And, as we know, for some odd reason — Ooh, ooh, I know.
I don't know if that's true or not, but I do know "Being in the public eye means having to say you're sorry often and quickly".
Think you know everything there is to know about the popular Web-based e-mail application from Google.
Not many people know David Monahan, but they sure know what he did.
What Ryan seems to know is what the world's most creative leaders all know: Less is best.
I know the busy season is upon us again, but want to make sure you know of the upcoming events.
If you know me, you know how much I LOVE shrimp.
I know this—and I fear that every cop worldwide knows this TSA included.
We know, we know, 2012 turned out not to be "Our Time".
We know you probably already know where to go to vote today, but just in case, you can check here to find your official location.
I know know your asking yourself what did he do to win a "Gold Man".

In science:

There are many situations where a sequence of numbers is measured and one would like to know the following numbers without knowing the rule which produces these numbers .
Predicting and generating time series by neural networks: An investigation using statistical physics
This is analogous to doing probability theory knowing the diffusion equation but not knowing Kolmogorov’s axioms.
Physics with exotic probability theory
Not answering these questions is really not knowing the fermionic sector of the theory (or knowing it very poorly, within the context of a rough approximation).
Exact Renormalization of Massless QED2
The easier way, however, is: we know that the theory has N = 2 supersymmetry, and we know the gauge group and matter content → from here the theory is uniquely defined by supersymmetry considerations 4 .
Marginal Deformations of N=4 SYM and of its Supersymmetric Orbifold Descendants
In the oneshot case we have to know exactly when to measure the walk, which usually means that we have to know the dimension of the hypercube or the shape of the graph in more general applications.
Quantum Random Walks Hit Exponentially Faster