When you bad-mouth someone or something, it means you speak negatively about that someone or something.
To criticise or disparage, often spitefully or unfairly.
- To speak disloyally of.
1. I wish you would stop bad-mouthing the computer and ask someone for help instead.
2. It’s difficult to keep your friends when you are known to bad-mouth them behind their backs.
3. Did it ever occur to you that it’s hypocritical to work for the government but bad-mouth them behind closed doors?
4. She’s always bad-mouthing her colleagues.
abuse, attack with words, belittle, blow off, criticise, cuss out, cut down to size, dis, disparage, dump on, find fault, insult, knock, malign, minimise, mudsling, nag, offend, pan, pick on, put down, rap, rip, roast, run down, slam, take a dig at, take down a peg, tear down, tear to pieces