sack out

1. 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.

Related Words

• bed down www.thesaurus.com
• doze 
• fall asleep 
• languish 
• relax 
• snooze