have someone by the balls
Have someone at one's mercy, as in You have to pay up—they've got you by the balls. The balls here allude to the male genitals. [Vulgar slang; early 1900s]
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.