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Verb: hit the sack
Usage: informal
  1. Prepare for sleep
    "It's getting late, I think I'll hit the sack";
    - 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: hits the sack, hit the sack, hitting the sack

Type of: go, locomote, move, travel