Sack
Bed
Example
Alright, I'm gonna hop in the sack. I'm tired. TTYL!
Sack definition by Slang.net - The Slang Dictionary
This page explains what the slang term "Sack" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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When talking about sleeping, "sack" means "bed" (e.g., "I'm tired and going to hit the sack"). It is a common term you may see or hear people use online, in messages, and in person.
For example, your friend may be tired from a full day of work and text you, "I'm not gonna make it tonight, gonna hit the sack. Or, your dad may greet you in the morning, "11 am? Must have been hard to get out of the sack today."
Origin of sack
It is unclear who first coined the term, but it dates back to at least the 19th century when people would sleep on mattresses that were sacks filled with hay. This is also where the saying "hit the hay" comes from (hay in the sack).