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knock down

knock down - phrasal verb

  1. To cause to fall, as from a shot or blow: bring down, cut down, down, drop, fell, flatten, floor, ground, level, prostrate, strike down, throw. Slang deck. See rise.
  2. To pull down or break up so that reconstruction is impossible: demolish, destroy, dismantle, dynamite, level, pull down, pulverize, raze, tear down, wreck. Aerospace destruct. See help.