• WordNet 3.6
    • v flap pronounce with a flap, of alveolar sounds
    • v flap make a fuss; be agitated
    • v flap move noisily "flags flapped in the strong wind"
    • v flap move in a wavy pattern or with a rising and falling motion "The curtains undulated","the waves rolled towards the beach"
    • v flap move with a flapping motion "The bird's wings were flapping"
    • v flap move with a thrashing motion "The bird flapped its wings","The eagle beat its wings and soared high into the sky"
    • n flap any broad thin and limber covering attached at one edge; hangs loose or projects freely "he wrote on the flap of the envelope"
    • n flap a movable airfoil that is part of an aircraft wing; used to increase lift or drag
    • n flap a movable piece of tissue partly connected to the body
    • n flap the motion made by flapping up and down
    • n flap an excited state of agitation "he was in a dither","there was a terrible flap about the theft"
    • ***
Webster's Revised Unabridged Dictionary
  • Interesting fact: The Boeing 767 aircraft is a collection of 3.1 million parts from 800 different suppliers around the world: fuselage parts from Japan, center wing section from Southern California, flaps from Italy.
    • Flap (Far) A disease in the lips of horses.
    • Flap A hinged leaf, as of a table or shutter.
    • Flap (Aeronautics) a movable part of an airplane wing, used to increase lift or drag, especially when taking off or landing. used often in the plural.
    • n Flap Anything broad and limber that hangs loose, or that is attached by one side or end and is easily moved; as, the flap of a garment. "A cartilaginous flap upon the opening of the larynx."
    • Flap The motion of anything broad and loose, or a stroke or sound made with it; as, the flap of a sail or of a wing.
    • Flap To beat with a flap; to strike. "Yet let me flap this bug with gilded wings."
    • Flap To fall and hang like a flap, as the brim of a hat, or other broad thing.
    • Flap To move as do wings, or as something broad or loose; to fly with wings beating the air. "The crows flapped over by twos and threes."
    • Flap To move, as something broad and flaplike; as, to flap the wings; to let fall, as the brim of a hat.
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: A dragonfly flaps its wings 20 to 40 times a second, bees and houseflies 200 times, some mosquitoes 600 times, and a tiny gnat 1,000 times.
    • n flap A stroke, blow, or buffet, as with the hand or with any weapon, etc.
    • n flap The motion of anything broad and loose; a flapping motion.
    • n flap An instrument for keeping off flies by a flapping motion.
    • n flap Anything broad and flexible that hangs loose, or is attached by one end or side, and easily moved; that part of anything which projects in such a form. The flap of a hat is that part of the brim which is turned up on one side, or is capable of being turned up; the flap of a waistcoat, that part of the long waistcoat of the eighteenth century which came down upon the thigh, extending on either side below and beyond the lowest button.
    • n flap A heavy valve used to prevent the entrance of the tide into a sewer.
    • n flap In surgery, a portion of skin or flesh separated from the underlying part, but remaining attached at the base. Flaps are made for various purposes in surgical operations, as for covering and growing over the end of an amputated limb, for forming a new nose (rhinoplasty), etc.
    • n flap plural A disease in the lips of horses, in which they become blistered and swell on both sides.
    • n flap plural A discomycetous fungus, Peziza cochleata.
    • n flap plural A broadly expanded hymenomycetous fungus, probably Agaricus arvensis.
    • flap To strike a blow with anything broad and flexible, as the hand; clap; make a noise like clapping.
    • flap To move in a waving or swaying manner, as wings, or as something broad or loose.
    • flap To burst out suddenly, as flames; flash.
    • flap To fall like a flap, as the brim of a hat or other broad thing.
    • flap To strike; beat; slap; give a stroke of any kind to.
    • flap To beat with or as if with a flap.
    • flap To make or cause a swaying movement of, as something broad or flap-like: as, the wind flapped the shutters.
    • flap To provide with a flap.
    • flap To let fall the flap of; move the flap of; especially, as in the case of a hat, to bring the flaps of forward and downward, so as to cover or protect the face.
    • flap To arouse the attention of, as by flapping the ears: apparently in allusion to the “flappers” employed for such a purpose in the feigned island of Laputa in “Gulliver's Travels.” See extract from Swift, under flapper, 1.
    • n flap In mycology, same as flab.
    • n flap In phonetics, a flapping motion of the tongue or uvula or the sound produced by it, as in vocalizing the letters l or r.
    • ***
Chambers's Twentieth Century Dictionary
  • Interesting fact: Elephants often communicate at sound levels as low as 5Hz. This means that if you flap your hands back and forth faster than five times a second, an elephant can actually hear the tone produced.
    • n Flap flap the blow or motion of a broad loose object: anything broad and flexible hanging loose, as the tail of a coat: a portion of skin or flesh detached from the underlying part for covering and growing over the end of an amputated limb
    • v.t Flap to beat or move with a flap
    • v.i Flap to move, as wings: to hang like a flap:—pr.p. flap′ping; pa.p. flapped
    • v.t Flap (Shak.) to swallow or devour, as in flap-dragon
    • ***


  • William Jennings Bryan
    William Jennings Bryan
    “I hope the two wings of the Democratic Party may flap together.”


Webster's Revised Unabridged Dictionary
OE. flappe, flap, blow, bly-flap; cf. D. flap, and E. flap, (v.)


In literature:

Some days later a bugle blast started Crittenden from a soldier's cot, when the flaps of his tent were yellow with the rising sun.
"Crittenden" by John Fox, Jr.
Will you help me put these flaps down?
"Sunny Slopes" by Ethel Hueston
Just then Rose saw something out over the ocean, sailing low and making a great flapping of black wings.
"Six Little Bunkers at Mammy June's" by Laura Lee Hope
The tent flaps had hardly closed on her when Daddy John attacked his employer.
"The Emigrant Trail" by Geraldine Bonner
Vollmar turned the head-flap back.
"The Mummy and Miss Nitocris" by George Griffith
He went to the flap of the tent, which, being down, did not give a view outside.
"Bunny Brown and His Sister Sue and Their Shetland Pony" by Laura Lee Hope
This makes small flaps to which crown may be fastened later.
"Make Your Own Hats" by Gene Allen Martin
The slit between the tails was the nose-line of the monster: whenever the tails flapped in the winter wind the dragons licked their lips.
"The Napoleon of Notting Hill" by Gilbert K. Chesterton
The sail merely flapped occasionally, and hung idly; and again the iceberg came grinding against us.
"Left on Labrador" by Charles Asbury Stephens
It spread out like a great, white bird with flapping wings and slowly fluttered to the earth.
"Watch Yourself Go By" by Al. G. Field

In poetry:

"I flapped wi my wings, master,
Till a' my bells they rang,
But still, the mair that I did flap,
Waken woud ye nane."
"The Broomfield Hill" by Andrew Lang
"How long I stood, I know not now,
Or how it gained near ;
But I heard the flapping of the robe,
O holy Father ! hear !...
"The Penitent's Confession" by Anne Bannerman
They all may home on a sleepy tide,
To the flap of the idle sail;
But it's never again the Nancy's Pride
That answers a human hail.
"The Nancy's Pride" by Bliss William Carman
But now the sky is green and gold,
The fiery sun has set at last.
I haste the flapping sail to fold,
And free it from the straining mast.
"Night On The River" by R S Ward
The north wind blows, and blasts, and raves,
And flaps his snowy wing:
Back! toss thy bergs on arctic waves;
Thou canst not bar our spring.
"Songs of the Spring Days" by George MacDonald
The hangings, rough with velvet flowers,
Flap on the latticed wall;
And o’er the mossy ridge-pole towers
The rock-hewn chimney tall.
"Agnes" by Oliver Wendell Holmes

In news:

Colbert Report' features Scott DesJarlais abortion flap.
Missouri abortion flap enters Tennessee race.
Apple Sanctioned in East Texas Over Deposition Flap.
Yahoo Draws Disgust in Flap over Jailed Chinese Journalist.
Police dispatcher fired amid Facebook flap.
THR's TV critic on Donald Trump and flap-jawed punditry (bad) and "The Daily Show" and Nate Silver's math skills (good).
Harbaugh, Schwartz, Downplay Last Year's Post Game Flap.
Team hopes to push aside White House flap, uneven performance against Capitals.
Komen exec quits after funding flap.
This cat is simply trying to use the cat flap to come into the house.
NY emergency boss fired in Sandy flap.
Restaurant manager quits after Facebook flap .
DA decision on gas flap charges near.
Teen returns to school after Romney T-shirt flap .
Big Bird ad causes a flap in US election campaign.

In science:

On the pitch is affected by other inputs: the position of thrust lever ݔଶ (t), the angular position of the flaps ݔଷሺݐሻ and angular position of the stabilizer ݔସ (t).
Suppression of random noise by the separation of frequencies
Transition from ciliary to flapping mode in a swimming mollusc: Flapping flight as a bifurcation in Reω . J.
The hydrodynamics of swimming microorganisms
With a transit time through the boundary layer of about two minutes we arrive at a thickness of 12000 km. In the case that the magnetopause is flapping back and forth during the two minutes, this thickness is overestimated.
T.I.P.O. (Tesla Interferometric Planetary Observer)