deep-six
idiom

- to get rid of, discard, eliminate

- to discard, cancel, halt; to completely put an end to something.

Merriam-Webster / Oxford Languages

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PHRASE ORIGIN

“Deep six” is an English phrase of likely nautical origins, most commonly hyphenated and used as a verb. It indicates a water depth of 6 fathoms (11 meters) as measured by a sounding line (Lotleine).

The “leadsman” called out the depth as he read it off the line. Six fathoms would be reported as “by the deep six.”

The phrase likely derived from the idea that something thrown overboard at or greater than this depth would be difficult if not impossible to recover.

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DEEP LANGUAGE

- to be thrown in (at) the deep end = to be forced to begin doing something very complex and/or unfamiliar, especially suddenly and without guidance, assistance, or preparation.

- beauty is only skin deep = (proverb) physical attractiveness does not equate to substance or character.

- between the devil and the deep blue sea = facing two equally unpleasant, dangerous, or risky alternatives, when the avoidance of one ensures encountering the harm of the other.

- deepfake = a fake video of someone created using artificial intelligence methods (“deep learning”), typically with the goal of mimicking that person’s physical attributes and mannerisms to the extent that it appears real.

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SYNONYMS

- to throw away (something unwanted or useless):

abandon, axe, bin, boot out, bung away (out), can, cancel, cashier, cast aside (away, off, out) chuck, chuck away (out), consign to scrap heap, decommission, DEEP SIX, discard, dispose of, ditch, divest yourself of, do away with, drop, dump, fling away (off, out), forgo, furlough, get rid of, get shot of, give the boot, give the bum’s rush, give up, have done with, jettison, junk, kick out, kiss goodbye (off), knock something on the head, let drop (fall, go, go of), loosen one’s hold on, manage without, offload, part with, pull the plug on, put out to pasture, reject, release, relieve yourself of, relinquish, renounce, retire, rid oneself of, scrap, scrub, see the back of, send packing, set aside, shake off, shed, shelve, shrug off, shut the door on, sideline, sweep away, throw aside (away, off, on the scrapheap, out, overboard), toss out, trash, turf out, unburden, unload, wash your hands of, weed out, write off

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SMUGGLE OWAD into an English conversation, say something like:

“The management DEEP-SIXED the proposal Andy had been working on for several weeks.”

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