de ‧ nounce /dɪˈnaʊns/ BrE AmE verb [transitive]
[ Date: 1300-1400 ; Language: Old French ; Origin: denoncier 'to announce' , from Latin denuntiare , from nuntiare 'to report' ]
1 . to express strong disapproval of someone or something, especially in public ⇨ denunciation :
Amnesty International denounced the failure by the authorities to take action.
denounce somebody/something as something
He denounced the election as a farce.
2 . to give information to the police or another authority about someone’s illegal political activities
denounce somebody to somebody
She denounced him to the police.