deep six

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deep-six

[deep-siks]
verb (used with object) Slang.
1.
to throw overboard.
2.
to get rid of; abandon; discard.
3.
to reject, negate, or ruin: The team deep-sixed the manager's attempt to call Sunday practice.

Origin:
1950–55; v. use of deep six

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
deep-six
 
vb
slang (US) (tr) to dispose of (something, such as documents) completely; destroy
 
[C20: from six feet deep, the traditional depth for a grave]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

deep six
"discard," 1940s, originally from nautical slang, perhaps from earlier underworld sense of "the grave" (1929), perhaps a reference to the usual grave depth of six feet.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

deep-six definition


To dispose of, discard, or get rid of: “The board of directors deep-sixed the proposal without even reading it.” This phrase is derived from the noun “deep six,” meaning burial at sea and referring to the depth of water necessary for such a burial. The term was later used as slang for a grave (customarily six feet underground) and, by extension, as a verb meaning “to kill.”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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American Heritage
Idioms & Phrases

deep six

  1. Also, give or get the deep six. Burial at sea. For example, When the torpedo hit our boat, I was sure we'd get the deep six. This expression alludes to the customary six-foot depth of most graves. [Early 1900s]

  2. Disposal or rejection of something, as in They gave the new plan the deep six. This usage comes from nautical slang of the 1920s for tossing something overboard (to its watery grave; see def. 1). It was transferred to more general kinds of disposal in the 1940s and gave rise to the verb to deep-six, for "toss overboard" or "discard."

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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