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Yours, Etc.: Origins and Uses of 8 Sign-Offs

time is up

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® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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