betray

to be disloyal to someone or something you should support, especially by helping the enemy or giving away secret information

traicionar, delatar

• betray somebody/something

Collocations betray a friend · betray state secrets

• He betrayed his country by passing secret information to the enemy.

  Traicionó a su país al pasar información secreta al enemigo.

to fail to keep a promise or to do something you should have done

fallar, decepcionar

• betray somebody's trust

Collocations betray a promise · betray an opportunity

• She betrayed her family's trust by not showing up at the funeral.

  Falló en la confianza de su familia al no asistir al funeral.