All 3 Uses

denounce
in
Annexation
(Auto-generated)

It is time then that all should cease to treat her as alien, and even adverse—cease to denounce and vilify all and everything connected with her accession—cease to thwart and oppose the remaining steps for its consummation; or where such efforts are felt to be unavailing, at least to embitter the hour of reception by all the most ungracious frowns of aversion and words of unwelcome.†
But that period has passed, and with it let its prejudices and its passions, its discords and its denunciations, pass away too.†
*

denunciations = criticisms or accusations
The singular result has been produced, that while our neighbor has, in truth, no real right to blame or complain—when all the wrong is on her side, and there has been on ours a degree of delay and forbearance, in deference to her pretensions, which is to be paralleled by few precedents in the history of other nations—we have yet laid ourselves open to a great deal of denunciation hard to repel, and impossible to silence; and all history will carry it down as a certain fact, that Mexico would have declared war against us, and would have waged it seriously, if she had not been prevented by that very weakness which should have constituted her best defence.†

denunciation = strong criticism or public accusation OR (more rarely) reporting someone to the authorities

Definitions:

(1) (denounce)
to strongly criticize or accuse publicly

or more rarely: to inform against someone (turn someone into the authorities)
(2) (meaning too rare to warrant focus)
Much more rarely, denounce can indicate the termination of a treaty or other formal agreement.