hit someone below the belt

hit (one) below the belt

To unfairly target one's weakness or vulnerability. The phrase refers to boxing, in which hitting an opponent below the waist is prohibited. I know she really wants the promotion, but she really hit me below the belt by telling the boss about my personal problems.
See also: below, belt, hit
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

hit someone below the belt

behave deviously towards someone, especially so as to gain an unfair advantage.
In boxing, delivering a blow below an opponent's waistline is against the rules.
See also: below, belt, hit, someone
Farlex Partner Idioms Dictionary © Farlex 2017

hit someone below the belt

tv. to deal with someone unfairly; to exploit someone’s vulnerabilities unfairly. (From boxing.) You were hitting Tom below the belt when you said that.
See also: below, belt, hit, someone
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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