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To go to bed or to fall asleep. I'd been getting up so early all week long that I was ready to sack out by 11 on Friday night. Jonathan sacked out in the passenger seat, so I had to drive nearly the whole way in total silence.
1. noun A hopelessly inept, blundering person who can't do anything right. That poor sad sack Sarah has been stuck in the same dead-end role in this company for years.
2. noun A sad, moping person, especially one who refuses to try and improve their mood or situation. Don't be such a sad sack—I know you're disappointed about missing the concert, but that doesn't mean we can't have fun tonight! He just sat there like a sad sack, sulking in the corner of the party.
3. verb To be in a sad, moping mood, especially while refusing to try and improve one's mood or situation. Usually used in the continuous tense; sometimes hyphenated. If you don't quit sad sacking back there, I'm going to turn the car around and drive us all straight back home! Bill's been sad-sacking around the office ever since he got passed over for the promotion.
to go to bed or go to sleep. It's time for me to sack out. Let's sack out early tonight.
Go to sleep, go to bed, as in We sacked out about midnight. This slangy idiom is a verbal use of the noun sack, slang for "bed" since about 1940; it alludes to a sleeping bag and appears in such similar phrases as in the sack, in bed, and sack time, bedtime.
A singularly inept person, as in Poor George is a hopeless sad sack. This term alludes to a cartoon character, Sad Sack, invented by George Baker in 1942 and representing a soldier in ill-fitting uniform who failed at whatever he tried to do. It was soon transferred to clumsily inept civilians.
sad sackan inept blundering person. informal, chiefly US
To sleep or go to sleep: After a long day at work, I sacked out on the couch.
in. to go to bed or go to sleep. (see also sacked out.) It’s time for me to sack out.
n. a sad person; a listless or depressed person. Tom always looks like such a sad sack.