• WordNet 3.6
    • v slacken make slack as by lessening tension or firmness
    • v slacken become looser or slack "the rope slackened"
    • v slacken become slow or slower "Production slowed"
    • v slacken make less active or fast "He slackened his pace as he got tired","Don't relax your efforts now"
    • ***
Webster's Revised Unabridged Dictionary
    • n Slacken (Metal) A spongy, semivitrifled substance which miners or smelters mix with the ores of metals to prevent their fusion.
    • Slacken To abate; to become less violent. "Whence these raging fires
      Will slacken , if his breath stir not their flames."
    • Slacken To be remiss or backward; to be negligent.
    • Slacken To become slack; to be made less tense, firm, or rigid; to decrease in tension; as, a wet cord slackens in dry weather.
    • Slacken To cause to become less eager; to repress; to make slow or less rapid; to retard; as, to slacken pursuit; to slacken industry. "Rancor for to slack .""I should be grieved, young prince, to think my presence
      Unbent your thoughts, and slackened 'em to arms."
      "In this business of growing rich, poor men should slack their pace.""With such delay
      Well plased, they slack their course."
    • Slacken To cause to become less intense; to mitigate; to abate; to ease. "To respite, or deceive, or slack thy pain
      Of this ill mansion."
    • Slacken To deprive of cohesion by combining chemically with water; to slake; as, to slack lime.
    • Slacken To end; to cease; to desist; to slake. "That through your death your lineage should slack .""They will not of that firste purpose slack ."
    • Slacken To languish; to fail; to flag.
    • Slacken To lose cohesion or solidity by a chemical combination with water; to slake; as, lime slacks .
    • Slacken To lose rapidity; to become more slow; as, a current of water slackens .
    • Slacken To neglect; to be remiss in. "Slack not the pressage."
    • Slacken To render slack; to make less tense or firm; as, to slack a rope; to slacken a bandage.
    • ***
Century Dictionary and Cyclopedia
    • slacken To become slack. To become less tense, firm, or rigid: as, a wet cord slackens in dry weather.
    • slacken To become less active; fall off: as, trade slackened; the demand slackens; prices slacken
    • slacken To become remiss or neglectful, as of duty.
    • slacken To make slack or slacker. To lessen or relieve the tension of; loosen; relax: as, to slacken a bandage, or an article of clothing.
    • slacken To abate; moderate; lessen; diminish the intensity, severity, rate, etc., of; hence, to mitigate; assuage; relieve: as, to slacken one's pace; to slacken cares.
    • slacken To be or become remiss in or neglectful of; remit; relax: as, to slacken labor or exertion.
    • n slacken The slags or cinder from previous fusions, used in smelting operations to mix with natural ores and to retard fusion of the ores until reduction shall have proceeded to the desired point.
    • ***
Chambers's Twentieth Century Dictionary
    • vs.i Slacken to become loose or less tight: to be remiss: to abate: to become slower: to fail or flag
    • ***


Webster's Revised Unabridged Dictionary
See Slack (a.)
Chambers's Twentieth Century Dictionary
A.S. sleac; Sw. slak, Ice. slakr.


In literature:

You must put your stick deep into the snow to slacken the speed and guide your sleigh.
"The Land of the Long Night" by Paul du Chaillu
As they approached the two Uhlans Ned slackened the speed of the motors.
"Boy Scouts Mysterious Signal" by G. Harvey Ralphson
It seemed in no way disposed to slacken its speed; but old Tom knew that if the harpoon held they would at length come up with it.
"The Voyage of the "Steadfast"" by W.H.G. Kingston
On this they somewhat slackened their pace, though they still held their weapons in a threatening manner.
"In the Wilds of Africa" by W.H.G. Kingston
The action lasted an hour and twenty minutes, when the Spaniards' fire sensibly slackened.
"Won from the Waves" by W.H.G. Kingston
She understood, also, when speech would slacken the tension of the mind.
"The Dew of Their Youth" by S. R. Crockett
In me the siege is so far slackened, as that we may come to fight, and so die in the field, if I die, and not in a prison.
"Devotions Upon Emergent Occasions" by John Donne
She hardly knew when the pace had slackened; she was benumbed with new sensations, darkness, speed and strength.
"Moor Fires" by E. H. (Emily Hilda) Young
Seventy-five feet from the top the strain slackened.
"The River of Darkness" by William Murray Graydon
Oliver for one moment slackened pace.
"The Fifth Form at Saint Dominic's" by Talbot Baines Reed

In poetry:

Belted on him then his sword,
Braced his slackened mail;
Doubting said: "I dreamed the Lord
Offered me the Grail."
"The Sangreal" by George MacDonald
O joyous idler in the sun,
In pity slacken here thy pace!
A lad, whose course is nearly run,
Is watching thee with wistful face.
"On The Promenade" by John Lawson Stoddard
For forty days, like a winged thing
She went before the gale,
Nor all that time we slackened speed,
Turned helm, or altered sail.
"The Old Man's Story" by Mary Botham Howitt
Often the tied strings of my lute slackened
at the strains of thy tunes.
And often at the ruin of wasted hours
my desolate evenings were filled with tears.
"Lord Of My Life" by Rabindranath Tagore
There was no power on earth to bid you slacken
The generous hand that painted her disgrace!
There was no shame on earth too black to blacken
That much-praised woman-face.
"Reassurance" by Charlotte Perkins Stetson Gilman
Ah, but the strength of regrets that strain and sicken,
Yearning for love that the veil of death endears,
Slackens not wing for the wings of years that quicken -
Years upon years.
"Recollections" by Algernon Charles Swinburne

In news:

Crude futures settle higher as the market weighs the potential disruption of a hurricane heading toward Texas with slackening demand.
"I was totally depressed by it," he said, his face slackening at the memory.
BEIJING — As China's economy slackens to its slowest pace in years, many U.S.-based multinationals are more dependent than ever on the country.
It's ratherish incongruous that you can pick up The New York Times (the voice of the Jet-Set) at a WINCO 24-Hour Savings Supermarket (which caters to those with a slacken life), in Vancouver, WA.
Rains expected to slacken after today.
Different from tightrope walking , the practice of slackening involves a stretchy bit of nylon wire that allows for more of a trampoline effect during tricks.
And some doctors say that once skin starts to slacken, pores often look larger, as if they've been stretched out of shape.

In science:

Finally, define a slackened simple random walk as a nondegenerate symmetric right-continuous walk.
On the probability that integrated random walks stay positive
Let Sn be a centered random walk that is two-sided exponential, slackened simple, or symmetric two-sided geometric.
On the probability that integrated random walks stay positive
Since we need rates for both positive and negative excursions, the only slackened random walks would be covered, giving no refinement to Theorem 2. 3.
On the probability that integrated random walks stay positive
However, the gap ωQ grows with x,44 effectively slackening the momentum dependence of ω−4 k and promoting the separation of the susceptibility maxima from the antiferromagnetic wave vector.
Magnetic incommensurability in $p$-type cuprate perovskites