- (in boxing) an illegal blow below the waist of an opponent.
- an unfair or unsportsmanlike criticism or attack.
Origin of low blow
Idioms and Phrases with low blow
An unscrupulous attack; an insult. For example, When my roommate moved out without a word of warning, leaving me to pay the entire rent, that was a low blow, or She wanted to win the argument, but bringing up his failed marriage was a low blow. This term alludes to the illegal practice of hitting an opponent in boxing below the belt. [c. 1950]