Verb
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give away information about somebody
"He told on his classmate who had cheated on the exam"
- tell on - give away -
announce the termination of, as of treaties
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to accuse or condemn or openly or formally or brand as disgraceful
"He denounced the government action"
"She was stigmatized by society because she had a child out of wedlock"
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speak out against
"He denounced the Nazis"