see also: Knock
Pronunciation Noun


  1. An abrupt rapping#Noun|rapping sound#Noun|sound, as from an impact#Noun|impact of a hard object#Noun|object against wood.
    I heard a knock on my door.
  2. A sharp#Adjective|sharp impact.
    He took a knock on the head.
  3. (figuratively) Criticism.
    • 2012, Tom Lamont, How Mumford & Sons became the biggest band in the world (in The Daily Telegraph, 15 November 2012)
      Since forming in 2007 Mumford & Sons have hard-toured their way to a vast market for throaty folk that's strong on banjo and bass drum. They have released two enormous albums. But, wow, do they take some knocks back home.
  4. (automotive) Preignition, a type of abnormal combustion occurring in spark#Noun|spark ignition engines caused by self-ignition; also, the characteristic knocking sound associated with it.
  5. (cricket) A batsman's innings.
    He played a slow but sure knock of 35.
  6. (cycling) Synonym of hunger knock#English|hunger knock
Translations Translations Translations
  • Italian: autocombustione

knock (knocks, present participle knocking; past and past participle knocked)

  1. (transitive, dated) To strike#Verb|strike for admittance; to rap#Verb|rap upon, as a door.
    • c. 1594, William Shakespeare, “The Comedie of Errors”, in Mr. William Shakespeares Comedies, Histories, & Tragedies: Published According to the True Originall Copies (First Folio), London: Printed by Isaac Iaggard, and Ed[ward] Blount, published 1623, OCLC 606515358 ↗, [Act III, scene i]:
      Master, knock the door hard.
  2. (transitive, colloquial) To criticize verbally; to denigrate; to undervalue#Verb|undervalue.
    Don’t knock it until you’ve tried it.
  3. (transitive, soccer) To kick#Verb|kick a ball#Noun|ball towards another player; to pass#Verb|pass.
  4. (transitive, Britain, slang, dated) To impress forcibly or strongly; to astonish; to move#Verb|move to admiration or applause.
  5. (ambitransitive, dated) To bump#Verb|bump or impact#Verb|impact.
    I knocked against the table and bruised my leg.
    I accidentally knocked my drink off the bar.
    • 1900, L. Frank Baum, The Wonderful Wizard of Oz Chapter 23
      "The Silver Shoes," said the Good Witch, "have wonderful powers. And one of the most curious things about them is that they can carry you to any place in the world in three steps, and each step will be made in the wink of an eye. All you have to do is to knock the heels together three times and command the shoes to carry you wherever you wish to go."
  6. (intransitive) To rap one's knuckle#Noun|knuckles against something, especially wood.
    Knock on the door and find out if they’re home.
    • 1678, John Bunyan, The Pilgrim’s Progress from This World, to That which is to Come: […], London: Printed for Nath[aniel] Ponder […], OCLC 228725984 ↗; reprinted in The Pilgrim’s Progress (The Noel Douglas Replicas), London: Noel Douglas, […], 1928, OCLC 5190338 ↗, page 3 ↗:
      Then ſaid Evangeliſt, Keep that light in your eye, and go up directly thereto: ſo ſhalt thou ſee the Gate; at which, when thou knockeſt, it ſhall be told thee what thou ſhalt do.