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1. verb To speak negatively or unflatteringly about someone or something. Why are you always bad-mouthing Tiffany? You don't even know her that well!
2. noun One who says negative or unflattering things about someone or something. He's a real bad-mouth, so don't listen to anything he says about me!

bad-mouth someone or something

to say negative things about someone or something. Mr. Smith was always bad-mouthing Mrs. Smith. They just didn't get along. John bad-mouths his car constantly because it is too small for him.

bad mouth

Disparage or criticize unduly, malign, as in Why do you constantly bad mouth your colleagues? This term is believed to be of African origin, where the phrase bad mouth signifies a curse or evil spell. [1930s]
See also: bad, mouth


1. tv. to speak ill of someone or something. (see also dirty mouth, poor-mouth.) I wish you would stop bad-mouthing my car.
2. n. someone who speaks ill of someone or something. Harry is such a bad-mouth!
References in periodicals archive ?
Blunkett moved to stop Hurdle badmouthing him and after the row the civil servant was promoted to another position and given a pay rise.
8, Tarver hasn't stopped complaining about the decision, nor has he stopped badmouthing Jones.
Prime Minister Junichiro Koizumi on Wednesday blasted a key rival in his ruling Liberal Democratic Party (LDP) for badmouthing senior party colleagues over the Sept.
Kielty actually told him off for badmouthing people from Northern Ireland and said if he wasn't too careful that a lynch mob would be waiting outside for him.
It is easy to get angry and try to get even by verbally abusing your superior or badmouthing the administration or the Board to everyone who will listen.
Disgruntled customers are doing more than badmouthing the company.
Political correctness, for one, has reached almost parodistic extremes in badmouthing the dashing subject of Sir Frank Swettenham, 1904, governor of the Malay States and a type that would later inspire Noel Coward's "Mad Dogs and Englishmen Go Out in the Midday Sun.
Ridenour's badmouthing of several existing parks is a serious error for a director or former director to make.
Shoppers are eager to spread the word about great products rather than badmouthing the worst.
While Assaf responded to Dounia's badmouthing last year, saying, " I've only met you once in my entire life, so why would you hold so much hatred for me?
If his affection for our national legend follows the choppy path of his past relationships, he'll declare undying love by the weekend and then he'll have kicked her out and be badmouthing her on Twitter by the end of the month.
This obviously wasn't very nice and I told him to stop badmouthing the man reminding him that, after all, he is a human being.
Q After a stupid spat last year with a fellow member of a charity committee, I admit I went round badmouthing her for being so unbelievably bossy that she puts everyone's back up.
I'M sick of hearing people badmouthing Test cricket, writes James Milton.