Deep-six meaning

Burial at sea.
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Disposal or rejection of something.

Gave all our plans the deep six.

noun
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To toss overboard.
verb
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To toss out; get rid of.

Deep-sixed the incriminating papers.

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Burial at sea.
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A discarding or disposing of something.
noun
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To get rid of, as by throwing overboard.
verb
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(US, idiomatic) To throw something overboard from a ship.
verb
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(US, idiomatic) To get rid of something unwanted.

First, the stark message to “eat less" of a particular food has been deep-sixed. - 28/01/2007, New York Times.

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Origin of deep-six

American slang a grave, referring to the conventional depth of a grave (six feet)