denounce in WordNet English dictionary

1. give away information about somebody
   "He told on his classmate who had cheated on the exam"
   denounce  tell on  betray  give away  rat  grass  shit  shop  snitch  stag 
   
2. 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"
   stigmatize  stigmatise  brand  denounce  mark 
   
3. speak out against
   "He denounced the Nazis"
   denounce 
   
4. announce the termination of, as of treaties
   denounce