Definition of bad-mouth verb from the Oxford Advanced Learner's Dictionary

 

bad-mouth

 verb
verb
BrE
 
; NAmE
 
Verb Forms present simple I / you / we / they bad-mouth
BrE
 
; NAmE
 
he / she / it bad-mouths
BrE
 
; NAmE
 
past simple bad-mouthed
BrE
 
; NAmE
 
past participle bad-mouthed
BrE
 
; NAmE
 
-ing form bad-mouthing
BrE
 
; NAmE
 
 
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bad-mouth somebody (informal) to say unpleasant things about somebody No one wants to employ somebody who badmouths their former employer.
See the Oxford Advanced American Dictionary entry: bad-mouth