betray
US /bɪˈtreɪ/
UK /bɪˈtreɪ/

1.
revelar, trair
to reveal (information) unintentionally or by disloyalty
:
•
His nervous laughter betrayed his true feelings.
Seu riso nervoso revelou seus verdadeiros sentimentos.
•
He betrayed the secret location of the hideout.
Ele revelou a localização secreta do esconderijo.
2.
trair
to be disloyal to (one's country, a person, or an organization) by disclosing secrets or otherwise aiding an enemy
:
•
He was accused of betraying his country.
Ele foi acusado de trair seu país.
•
She felt betrayed by her closest friend.
Ela se sentiu traída por sua amiga mais próxima.