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Adjective: below the belt
  1. (boxing) disregarding the rules (from the notion of an illegal low blow in boxing)
    "her accusations were below the belt"
Adverb: below the belt
  1. In an unfair manner
    "their accusations hit below the belt";
    - unfairly, dirty

See also: unfair, unjust

Antonym: fairly

Encyclopedia: Below the belt