below the belt, hit

below the belt, hit

Not behave according to the rules or decency, unfairly, as in Bringing up my mother's faults-that's really hitting below the belt. The term comes from boxing, where according to the Marquis of Queensberry Rules (1865) a fighter may punch his opponent only in the upper body or head. For a synonym, see low blow; also see under one's belt.
See also: below, hit