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Verb: hit the sack
Usage: informal
  1. Prepare for sleep
    "He hits the sack at the crack of dawn";
    - go to bed, turn in [informal], bed, kip down [informal], hit the hay [informal], sack out [N. Amer, informal], go to sleep, retire

Derived forms: hitting the sack, hit the sack, hits the sack

Nearest

hit squad
hit the books
hit the bottle
hit the ceiling
hit the deck
hit the dirt
hit the hay
hit the jackpot
hit the road
hit the roof
hit the sack
hit the spot
hit the trail
hit-and-miss
hit-and-run
hitch
hitch up
Hitchcock
hitcher
hitchhike
hitchhiker