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sack out

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Go to sleep, go to bed, as in We sacked out about midnight. This slangy idiom is a verbal use of the noun sack, slang for “bed” since about 1940; it alludes to a sleeping bag and appears in such similar phrases as in the sack, in bed, and sack time, bedtime.

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Let’s start with some etymology: What are the origins of the typographical word “bracket”?
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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