Hit The Sack
Hit The Sack : Phrases
To go to bed, to retire for the evening to sleep.
Man, am I bushed, I'm going to hit the sack.
Although fallen out of common usage, one definition of a sack is a bed. Early mattresses were often made from a cloth sack stuffed with hay, hair, or some other form of padding.
In fact sack out is defined as to go to bed, to go to sleep.
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