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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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
in. to go to sleep or to bed. (see also rack.) What time do you rack out?
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.