knock out - definition and synonyms

phrasal verb [transitive]
present tense
I/you/we/theyknock out
he/she/itknocks out
present participleknocking out
past tenseknocked out
past participleknocked out
  1. 1
    to make someone unconscious

    He hit me and nearly knocked me out.

  2. 2
    to make someone leave a competition by defeating them

    England had been knocked out of the World Cup by West Germany.

  3. 3
    to destroy something, or to stop it working

    The earthquake knocked out power supplies in many parts of the city.

  4. 4
    knock someone out informal to impress someone very much

    The response to my work has absolutely knocked me out.

  5. 5
    knock someone out informal to make someone feel very shocked or upset
  6. 6
    informal to produce something quickly or carelessly

    They’ve been knocking out candles at their factory since 1831.

  7. 7
    knock something out of someone to make someone lose a quality

    All the enthusiasm had been knocked out of him.

  8. 8
    knock yourself out informal to do a lot of work in order to achieve something
See also main entry: knock