To Denounce

1. (transitive, obsolete) To make known in a formal manner; to proclaim; to announce; to declare.
2. (transitive) To criticize or speak out against (someone or something); to point out as deserving of reprehension, etc.; to openly accuse or condemn in a threatening manner; to invoke censure upon; to stigmatize; to blame.
3. (transitive) To make a formal or public accusation against; to inform against; to accuse.

to denounce a confederate in crime

to denounce someone to the authorities

(transitive, obsolete) To proclaim in a threatening manner; to threaten by some outward sign or expression; make a menace of.

to denounce war; to denounce punishment

(transitive) To announce the termination of; especially a treaty or armistice.

(US, historical) To claim the right of working a mine that is abandoned or insufficiently worked.

attack, charge, condemn, criticize, damn, decry, discredit, inveigh against, proscribe, report