sleep in

sleep in idiom
  1. Sleep at one's place of employment, as in They have a butler and maid who both sleep in. [First half of 1800s]
  2. Sleep late, either accidentally or deliberately. For example, I slept in and missed my usual train, or On weekends we like to sleep in. [Late 1800s]

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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