deep six

Deep six is an American slang term that means, when used as a verb (as in "to deep-six"), to ignore, get rid of, toss out, or throw overboard. It is a reference to the approximate depth of six fathoms (11 meters), the minimum legal death needed for a burial at sea. It may also refer to six feet for a grave.
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The Deep Six compilation was released March 1986 (catalog# CZ001). It was the very first release by C/Z Records, a few months before the release of "Sub Pop 100" from Sub Pop Records. It was also arguably the first record to influence the later "Seattle sound" that would be known worldwide as grunge. The album was reissued as a joint C/Z Records/A&M Records release on April 6 1994 (catalog # 6971 2400 2)
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Verb
1. toss out; get rid of; "deep-six these old souvenirs!"
(synonym) give it the deep six
(hypernym) discard, fling, toss, toss out, toss away, chuck out, cast aside, dispose, throw out, cast out, throw away, cast away, put away
2. throw from a boat
(synonym) throw overboard
(hypernym) throw

in a six-foot-deep grave, pushing up daisies If you overdose on coke, you're deep six, man.

Synonyms and related words:
abandon, barrow, beehive tomb, bone house, box grave, burial, burial at sea, burial chamber, burial mound, burying, cast, cast aside, cast away, cast off, castaway, castoff, catacombs, cenotaph, charnel house, chuck, cist, cist grave, cortege, cromlech, crypt, dead march, dice, dirge, discard, discarding, disposal, dispose of, ditch, dokhma, dolmen, dump, dumping, eighty-six, eliminate, elimination, funeral, funeral procession, get quit of, get rid of, get shut of, give away, grave, house of death, jettison, jilt, junk, junking, last home, last post, long home, low green tent, low house, mastaba, mausoleum, monstrance, muffled drum, mummy chamber, narrow house, ossuarium, ossuary, part with, passage grave, pit, pyramid, refuse, reject, rejectamenta, rejection, reliquary, removal, remove, resting place, scrap, scrapping, sepulcher, shaft grave, shrine, slough, stupa, taps, throw away, throw out, throw over, throw overboard, throwaway, tomb, tope, toss overboard, tower of silence, tumulus, vault,