Definition

to betray: to be disloyal, to be unfaithful (to someone) verb
Jack would never betray John unless there was a woman involved. Then he would be very disloyal!
to betray a secret to give away, to fail to keep, to reveal a secret
  • "How could you betray me?"
  • "Godfather : You can't trust Southside Johnny, he'll betray you when you least expect it."
  • "If this monkey were to betray Horatio's secrets to one of our competitors, what are the consequences?"

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