1. To stop acting or pretending to be a character, especially unintentionally during a performance
The actor was breaking character when he laughed at the comedian's joke.
O ator saiu do personagem quando riu da piada do comediante.
2. To abandon a pretense or false persona in social interaction
She was breaking character during the prank when she smiled too much.
Ela saiu do personagem durante a brincadeira quando sorriu demais.