Definitions for sack out
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Princeton's WordNet
go to bed, turn in, bed, crawl in, kip down, hit the hay, hit the sack, sack out, go to sleep, retire(verb)
prepare for sleep
"I usually turn in at midnight"; "He goes to bed at the crack of dawn"
Wiktionary
sack out(Verb)
To fall asleep, usually from implied exhaustion.
Origin: Outgrowth of the earlier idiom, to hit the sack, with possible influences from other senses of to sack (tackle, pillage), and to sock (hit, slam), providing an implication that sleep has been thrust upon a person.
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"sack out." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/sack out>.

