hit the hay | hit the sack
Meaning: If you hit the hay, or hit the sack, you go to bed.
- It's after midnight so it's time I hit the hay.
- You look really tired. What time did you hit the sack last night?
Origin: Probably related to the fact that in the U.S.A. in the late nineteenth century and early twentieth century mattresses often consisted of old sacks filled with hay or straw.
Variety: This idiom is typically used in American English but may be used in other varieties of English too.
I'd better hit the hay. I have to
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Contributor: Matt Errey