1. to behave badly or inappropriately; to conduct oneself in a manner that is not acceptable or proper
The child misbehaved during the class and had to sit in the corner.
A criança comportou-se mal durante a aula e teve que ficar sentada no canto.
2. to act in a way that violates rules, expectations, or social norms
If you misbehave at the dinner party, you will be grounded.
Se você se comportar mal na festa de jantar, você será castigado.
3. (informal) to flirt or behave in a playfully improper manner
She was misbehaving on the dance floor.
Ela estava se comportando de forma malcriada na pista de dança.