noun
a nautical term referring to the depth of six fathoms, or approximately 36 feet
verb
to dispose of or get rid of something, often by throwing it overboard
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The captain ordered the crew to deep six the damaged cargo to prevent it from sinking the ship.
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We need to deep six this old couch and get a new one for the living room.
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Let's deep six this plan and come up with something better.
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She decided to deep six her past mistakes and start fresh in a new city.