1. An abrupt rapping sound, as from an impact of a hard object against wood
    I heard a knock on my door.
  2. An impact.
    He took a knock on the head.
  3. criticism
  4. a batsman's innings.
    He played a slow but sure knock of 35.
  5. Preignition, a type of abnormal combustion occurring in spark ignition engines caused by self-ignition or the characteristic knocking sound associated with it.


  1. To rap one's knuckles against something, especially wood.
    Knock on the door and find out if they're home.
  2. To strike for admittance; to rap upon, as a door.
  3. To bump or impact.
    I knocked against the table and bruised my leg.
    I accidentally knocked my drink off the bar.
  4. To denigrate, undervalue.
    Don't knock it until you've tried it.
  5. To pass, kick a ball towards another player.

The above text is a snippet from Wiktionary: knock
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