hit (one) 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

hit below the belt

To unfairly target another person's weakness or vulnerability. The phrase refers to boxing, in which hitting an opponent below the waist is unacceptable. I know she really wants the promotion, but she hit below the belt when she told the boss about my personal problems.
See also: below, belt, hit
Farlex Dictionary of Idioms.

hit someone below the belt

 
1. Lit. [for a boxer] to strike an opponent below the belt. (An unfair blow.) The champ hit the contender below the belt and the crowd began to boo like fury. Fred was hit below the belt and suffered considerably.
2. Fig. to deal someone an unfair blow. That's not fair! You told them I was the one who ordered the wrong-size carpet. That's hitting me below the belt. Todd hit below the belt when he said it was all her fault because she had become ill during the trip.
See also: below, belt, hit
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

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

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
See also:
  • hit below the belt
  • hit someone below the belt
  • below the belt
  • below the belt, hit
  • be below the belt
  • smell blood
  • scent blood
  • get (one) over a barrel
  • get someone over a barrel
  • over a barrel