Meanings
Attested since the 1920s as a noun, most likely from the nautical cry “by the deep six” indicating a depth of 6 fathoms (36 feet, 10.97 metres)[1][2] as measured by a sounding line[3] (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).[2] Attested since the 1950s as a verb.[1][4][2]
How to pronounce "deep six":
AU
To discard, get rid of, or cancel; to completely put an end to something.
Example: "They had put many hundreds of hours into the project before it was deep-sixed by management."
Ejection, discardment or destruction.
The grave or death; also, the (notional) place where something is discarded.
Example Sentences
1
They decided to deep six the old work and start fresh with a new approach.
2
The company decided to deep six their outdated product and focus on a more modern version.
3
He deep sixed all of his old clothes and bought a completely new wardrobe.
4
The manager deep sixed the project after realizing it was not feasible.
5
She deep sixed her old phone and upgraded to the latest model.
