To produce an affect or strain on somebody.
1. Donner.
2. (Familier) Moucharder. Dénoncer quelqu'un.
3. Stigmatiser. Dénoncer des abus.
4. Annuler. Dénoncer un contrat.
When you tell on people, you inform someone in authority, such as a parent or teacher, that they have made a mistake or broken a rule.