hit the sack

A reference to how farmers tend to sleep on sacks of hay.

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hit the sack (third-person singular simple present hits the sack, present participle hitting the sack, simple past and past participle hit the sack)

1. (slang) To go to bed.
   • 1953, "New Army, Familiar Scenes" (photo essay), New York Times, 18 Jan., p. SM45 (caption):

     K.P. Arches—Like a housewife who spends a day on the range, a soldier gets tired feet and is eager to hit the sack.

• hit the hay
• hit the rack
• turn into a pumpkin
• hit the sheets

• sack out