1. below the belt - Adverb
2. below the belt - Phrase
3. below the belt - Adjective Satellite
disregarding the rules (from the notion of an illegal low blow in boxing)
in an unfair manner
Source: WordNetThe art of politics consists in knowing precisely when it is necessary to hit an opponent slightly below the belt. Konrad Adenauer
her accusations were below the belt Source: Internet
they dealt with him unfairly Source: Internet
their accusations hit below the belt Source: Internet
A belt worn over the torso represents the lower limit of punches – any boxer repeatedly landing low blows below the belt is disqualified. Source: Internet
In general, boxers are prohibited from hitting below the belt, holding, tripping, pushing, biting, or spitting. Source: Internet