make demands on

make demands on idiom
Urgently require something of someone, as in Her mother's illness has made considerable demands on her time. [Late 1300s]

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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