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Entry 1 sense Webster, 1913

Knock-out

· Knock·-out · IPA
01 a. That knocks out; characterized by knocking out; as, a knock-out blow; a knock-out key for knocking out a drill from a collet.
  1. 1.
    That knocks out; characterized by knocking out; as, a knock-out blow; a knock-out key for knocking out a drill from a collet.