Wiktionary
sack out
vb. (context idiomatic English) To fall asleep, usually from implied exhaustion.
WordNet
sack out
v. go to bed in order to sleep; "I usually turn in at midnight"; "He turns out at the crack of dawn" [syn: go to bed, turn in, bed, crawl in, kip down, hit the hay, hit the sack, go to sleep, retire] [ant: get up, get up]
Usage examples of "sack out".
He got a sack out of the buggy, shouldered it, and staggered with it through the cottage yard, and knocked at the door.
He tossed the sack out into the middle of the yard, about twenty paces away.
The sack out ahead of him, sunk, heavy in the water, pulling from his shoulders.
They's six guards outside with a great big sack, an' Hooligan comes quiet down the rope an' they jus' hol' the sack out an' he goes right inside.