low blow
Noun
Meaning
unscrupulous abuse
Source: WordNetSynonyms
barb
injury
slight
abuse
crack
libel
insult
defamation
slander
affront
slur
jibe
indignity
sucker punch
dirty trick
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Antonyms
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Examples
I am just thinking how unfair it is of you to quote their own words. It is a low blow to use what ExxonMobil has actually said against them. I mean, that is kind of a cheap shot, don't you think?
It's settled, then," Grace said. She turned back to Nick. "Take the Jag to the car wash and for heaven's sake clean the McDonald's Happy Meal boxes out of it." "Hey," Nick said, his face offended. "That's a low blow. Those boxes are collectibles.