Meaning of HIT THE SACK

WordNet Dictionary
	Definition:		[v]  go to bed in order to sleep; "I usually turn in at midnight"; "He turns out at the crack of dawn"
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	Synonyms:		crawl in, get into bed, go to bed, go to sleep, hit the hay, kip down, retire, sack out, turn in
	Antonyms:		arise, get up, rise, turn out, uprise
	See Also:		bed down, bunk down