catch some z's

catch some z's idiom
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]

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.

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