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[nok] /nɒk/
verb (used without object)
to strike a sounding blow with the fist, knuckles, or anything hard, especially on a door, window, or the like, as in seeking admittance, calling attention, or giving a signal:
to knock on the door before entering.
to strike in collision; bump:
He knocked into a table.
to make a pounding noise:
The engine of our car is knocking badly.
Informal. to engage in trivial or carping criticism; find fault.
Cards. to end a game, as in gin rummy, by laying down a hand in which those cards not included in sets total less than a specific amount.
verb (used with object)
to give a sounding or forcible blow to; hit; strike; beat.
to drive, force, or render by a blow or blows:
to knock a man senseless.
to make by striking a blow or blows:
to knock a hole in the wall.
to strike (a thing) against something else.
Informal. to criticize, especially in a carping manner:
He's always knocking everything.
British Slang. to astound; impress greatly.
an act or instance of knocking.
the sound of knocking, especially a rap, as at a door.
a blow or thump.
Informal. an adverse criticism.
the noise resulting from faulty combustion or from incorrect functioning of some part of an internal-combustion engine.
Cricket. an innings.
British Slang.
  1. one of a combination of dealers who bid together, rather than against each other, at an auction, and later resell the purchases among themselves.
  2. an auction at which this is done.
  3. the sale of merchandise recently obtained by a dealer at an auction.
Verb phrases
knock around/about, Informal.
  1. to wander aimlessly or idly; loaf.
  2. to mistreat (someone), especially physically.
  3. to jar; shake up.
knock back, Slang. to drink (a beverage), especially quickly and heartily:
He knocked back two shots of vodka.
knock down,
  1. to sell at auction by a blow of the hammer or to a bidder.
  2. to take apart or disassemble, as for facility in handling, storing, shipping, etc.
  3. Slang. to receive, as a salary or a scholastic grade; earn:
    He knocks down 30 grand a year.
  4. Informal. to lower the price of; reduce:
    to knock down end-of-season leftovers.
  5. Slang. to embezzle or steal (money).
  6. to cause (a sailing vessel) to heel, as by a gust of wind, to such a degree that it cannot right itself.
knock off,
  1. Informal. to cease activity, especially work:
    to knock off at five every day.
  2. to stop doing something; quit:
    Knock it off or you'll get into a mess.
  3. Slang. to dispose of; finish.
  4. Slang. to murder; kill.
  5. Slang. to die.
  6. Slang. to get rid of; reduce.
  7. Slang. to disable or defeat.
  8. Slang. to commit a robbery at; steal from:
    The gang knocked off a gas station.
  9. Nautical Slang. to blow the head (of a sailing vessel) off the wind.
  10. to imitate, copy, or plagiarize:
    to knock off designer dresses in cheap materials.
knock out,
  1. to defeat (an opponent) in a boxing match by striking such a blow that the opponent is unable to rise within the specified time.
  2. to render (a person) unconscious:
    Those sleeping pills knocked me out for ten hours.
  3. to make tired or exhausted:
    Christmas shopping always knocks me out.
  4. Informal. to produce quickly, hurriedly, or with ease:
    He knocks out two poems a day.
  5. to damage or destroy:
    The explosion knocked out the power for several hours.
  6. knock (def 28).
knock over,
  1. to strike (someone or something) from an erect to a prone position:
    to knock over a lamp.
  2. to distress; overcome:
    When the announcement came we were completely knocked over.
  3. Slang. to rob, burglarize, or hijack:
    He knocked over five banks.
knock together, to make or construct in a hurry or with little attention to detail:
He knocked together a couple of tables.
knock up,
  1. Slang. to make pregnant.
  2. to exhaust; weary; tire.
  3. to damage; mar:
    The children knocked up the new table.
  4. to injure; wound:
    He was afraid to come home from school all knocked up again.
  5. British. to wake up; rouse; call:
    He knocked us up before dawn.
have it knocked, Slang. to be assured of success:
With a government job, he thought he had it knocked.
knock out of the box, Baseball. to cause a pitcher to be removed from the box because the pitcher has permitted too many hits to be made.
Also, knock out.
knock the / one's socks off, Informal. to have an overwhelming effect on:
The song knocked the socks off the audience.
Origin of knock
before 1000; 1890-95 for def 4; Middle English knokken, knoken (v.), Old English cnocian, cnucian; cognate with Old Norse knoka to thump, knock
Related forms
knockless, adjective
reknock, verb
unknocked, adjective
unknocking, adjective
1. See strike. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the Web for knocked out
Historical Examples
  • Thanks to your foresight, he was knocked out at the first round.

  • Teeth are knocked out, or filed into prescribed shapes, or blackened.

    Folkways William Graham Sumner
  • He moved to the table picked up his pipe and knocked out the ashes on the stove hearth.

    The Quirt B.M. Bower
  • He knocked out his pipe against an upright, sighed, and dropped it into his pocket.

    My Antonia Willa Cather
  • “I was knocked out,” replied the youth, with a sorry little laugh.

  • And suddenly I knew where Macartney's men had carried me when I was knocked out!

    The La Chance Mine Mystery Susan Carleton Jones
  • So fierce was the attack and the offense that Paul Drew was knocked out, and could not come back in time to play.

  • Had the friends resisted, their brains would have been knocked out.

    A Simpleton Charles Reade
  • They came out of my head—that is, they were knocked out—not all at once, but at different times.

    Hollow Tree Nights and Days Albert Bigelow Paine
  • If we do not grow our own food, we could be knocked out of time in the first round.

    Another Sheaf John Galsworthy

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