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1. Literally, a punch or blow struck beneath one's navel or belt line, typically considered unfair or unsportsmanlike. I stood up to confront the man for taking the money, but he landed a low blow and ran off while I was stunned. OK, I want a good, clean fight—no low blows, you hear me?
2. An attack or insult on someone that is considered particularly unscrupulous, unfair, or underhanded. I thought their campaign ad bringing up my divorce was an especially low blow. That's a low blow, Jeff. I simply couldn't afford to help pay for Mom's treatment at the time, and you know that!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
n. an unfair blow. (see also hit (someone) below the belt.) Coming in like that unannounced was a pretty low blow.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.