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Related to rack out: racks up
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To sleep or go to bed. "Rack" is a slang term for a bed, as well as for sleep itself. I just need to rack out for a few hours, and I'll feel as good as new! We should rack out soon, we have an early start tomorrow.
Sl. to go to bed and to sleep. I'm really tired. I've got to go rack out for a while. I racked out until nearly noon.
Go to sleep, as in I racked out about midnight. This slangy expression, as well as the related rack time, for sleeping or snooze time, use rack to refer to being laid out on a framework, here a bed.
in. to go to sleep or to bed. (see also rack.) What time do you rack out?