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Entry 2 senses Webster, 1913

deep-six

· IPA
01 v. t. to discard in a deep body of water; -- also used figuratively, to discard contemptuously.
  1. 1.
    to discard in a deep body of water; -- also used figuratively, to discard contemptuously.
  2. 2.
    to throw from a boat into the water.
Syn. deep six, give it the deep six. — Syn. -- deep six, throw overboard.