- deep six
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1. tv. to jettison something, including a corpse, from a ship at sea. (Usually deep-six as a verb.)□ The captain had them deep-six the garbage.□ They deep-sixed the body of the first mate, who had died of the shakes.2. the deep six n. burial at sea. (Always with the in this sense.)□ They gave her the deep six with full honors.□ I think I’d want the deep six, but I’ll probably kick off on dry land.3. tv. to kill or dispose of someone. (Underworld. Usually deep-six as a verb.)□ Mr. Big ordered Sam to deep-six Frank.□ The thugs tried to deep-six the witness, but failed.4. tv. to throw something away. (Usually deep-six as a verb.)□ Take this old thing out and deep-six it.□ I’ve got to deep-six this old TV set.5. the deep six n. a grave. (Always with the in this sense. Graves are usually six feet deep.)□ When you know the deep six is at the end of the line no matter who you are, it makes you take life less seriously.□ The deep six can’t be made attractive to many people.
Dictionary of American slang and colloquial expressions. 2015.