time is up

time is up idiom
The period of time allowed for something is ended, as in Turn in your papers, students; time is up. This idiom uses up in the sense of “completed” or “expired,” a usage dating from about 1400.

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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