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Related to rack out: racks up
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?