bad-mouth

US /ˈbæd.maʊθ/
UK /ˈbæd.maʊθ/
1.

falar mal

to say bad things about someone to other people:

:
•
Her coworkers bad-mouthed her to her boss.
:
mouthbadroof of the mouthhand-to-mouthmouth offbig mouthbe down in the mouth