catch some z's
American Heritage Dictionary of Idioms:
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catch some z's
Take a nap, go to sleep, as in I stayed up all night studying so I'd better catch some z's. This term alludes to the buzzing sound of snoring. [Slang; second half of 1900s]
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American Heritage Dictionary of Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Company. All rights reserved.
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