deep-sixed[ deep-siks ]SEE DEFINITION OF deep-sixed
Synonyms for deep-sixed
"place where something is discarded," by 1921 (in phrase give (something) the deep six), originally in motorboating slang, perhaps from earlier underworld noun sense of "the grave" (1929), which is perhaps a reference to the usual grave depth of six feet. But the phrase (in common with mark twain) also figured in the sailing jargon of sounding, for a measure of six fathoms:
In general use by 1940s. As a verb from 1953.