To say or do something to someone that is very unfair or cruel.
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To say or do something unfair or cruel.
Hitting below the belt means going after someone's weak spot in a way most people think is wrong.
The phrase comes from the rules of boxing.
"Cross the Line"
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Going beyond acceptable behavior generally, without the specific personal attack angle
"Low Blow"
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A cruel or unfair attack — very similar, but hit below the belt is more figurative
"Hit Below the Belt"
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Making an unfair, cruel, or personal attack that violates expected standards