below the belt is an adjective and adverb meaning "disregarding the rules (from the notion of an illegal low blow in boxing)". It carries 2 recorded senses.
disregarding the rules (from the notion of an illegal low blow in boxing)
“her accusations were below the belt”
boxing
in an unfair manner
“they dealt with him unfairly”
“their accusations hit below the belt”
Definitions, synonyms and semantic relations for below the belt come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.