deep six

Meanings

1. To discard, get rid of, or cancel; to completely put an end to something.
2. To submerge (something) in water.

1. An ejection, discardment or destruction.
2. The grave or death; also, the (notional) place where something is discarded.

Etymology

First use appears c. 1929 as a noun, most likely from the nautical cry by the deep six indicating a depth of six fathoms (36 feet, 11 metres) as measured by a sounding line (a depth at which something thrown overboard would be difficult to recover), though possibly also a reference to the common depth of graves (six feet). Attested since the 1950s as a verb.