on a string

on a string idiom
Under someone's control, as in She'll drop everything whenever Sam asks for something—he's got her on a string. This expression, alluding to pulling an animal on a leash, dates from the late 1500s, when it was put as in a string.

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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