Nearby words

  1. knobbly,
  2. knobby,
  3. knobcone pine,
  4. knobhead,
  5. knobkerrie,
  6. knock about,
  7. knock back,
  8. knock cold,
  9. knock dead,
  10. knock down

Idioms

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 formsknock·less, adjectivere·knock, verbun·knocked, adjectiveun·knock·ing, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019


British Dictionary definitions for knock out

knock

/ (nɒk) /

verb

noun


Word Origin for knock

Old English cnocian, of imitative origin; related to Old Norse knoka to hit

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for knock out
Online Etymology Dictionary, © 2010 Douglas Harper

Idioms and Phrases with knock out

knock out

1

Also, knock out cold. Render unconscious by a blow or some other means. For example, It was just a swinging door, but it knocked her out, or Just one of those sleeping pills can knock you out cold. [Late 1500s]

2

Make tired, exhaust, as in That sightseeing tour knocked me out.

3

Render useless or inoperative, as in The storm knocked out the power.

4

See knock off, def. 2.

5

See knock oneself out.

knock

In addition to the idioms beginning with knock

  • knock about
  • knock back
  • knock cold
  • knock dead
  • knock down
  • knock down with a feather
  • knock for a loop
  • knock into a cocked hat
  • knock it off
  • knock off
  • knock oneself out
  • knock on wood
  • knock out
  • knock over
  • knock over with a feather
  • knock someone's block off
  • knock someone's socks off
  • knock the bottom out of
  • knock the living daylights out of
  • knock the socks off
  • knock together
  • knock up

also see:

  • beat (knock) into someone's head
  • beat (knock) the living daylights out of
  • (knock) down to size
  • (knock) off someone's feet
  • school of hard knocks
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.