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Meaning of deep six

deep' six'

Pronunciation: [key]
— Slang. Slang.
  1. burial or discarding at sea.
  2. complete rejection or ruin.

deep-six

Pronunciation: (dēp'siks'), [key]
— v.t. Slang.
  1. to throw overboard.
  2. to get rid of; abandon; discard.
  3. to reject, negate, or ruin: The team deep-sixed the manager's attempt to call Sunday practice.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.