All 6 Uses of

denounce
in
The Scarlet Pimpernel

She denounced the Marquis de St. Cyr and all his family to the awful tribunal of the Terror.
Chpt 4 *

denounced = accused publicly

You say that she actually denounced the Marquis de St. Cyr?†
Chpt 4

denounced = strongly criticized or accused publicly OR (more rarely) informed against someone

That I denounced the Marquis de St. Cyr, you mean, to the tribunal that ultimately sent him and all his family to the guillotine?†
Chpt 7

Armand knew that: her impulses and imprudence, knew it still better; but Blakeney was slow-witted, he would not listen to "circumstances," he only clung to facts, and these had shown him Lady Blakeney denouncing a fellow man to a tribunal that knew no pardon: and the contempt he would feel for the deed she had done, however unwittingly, would kill that same love in him, in which sympathy and intellectuality could never had a part.†
Chpt 7

denouncing = strongly criticizing or accusing publicly OR (more rarely) informing against someone

In those days one denunciation was sufficient: Marguerite's few thoughtless words anent the Marquis de St. Cyr bore fruit within twenty-four hours.†
Chpt 8

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

He could not now advance many steps, without spying eyes to track and denounce him.†
Chpt 26

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)
meaning too rare to warrant focus:

Much more rarely, denounce can indicate the termination of a treaty or other formal agreement.