let out

let out idiom
  1. Allow to get out; also see get out of.
  2. Make known, reveal, as in I thought it was a secret—who let it out? [First half of 1800s] Also see let the cat out of the bag.
  3. Come to a close, end, as in What time does school let out? [Late 1800s]
  4. Increase the size of a garment, as in May's coat needs to be let out across the shoulders. This usage refers to opening some of the seams. [Late 1700s]

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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