Sack-out meaning

(idiomatic) To fall asleep, usually from implied exhaustion.

The kids sacked out in the back seat before we made it home.

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Origin of sack-out

Outgrowth of the earlier idiom, to hit the sack, with possible influences from other senses of to sack (tackle, pillage), and to sock (hit, slam), providing an implication that sleep has been thrust upon a person.