be disloyal to; give away or make know or sell treacherously
allow (a secret) to become known, either by accident or on purpose
"Her smile betrayed her true feelings"
"Judas sold Jesus"
"The spy betrayed his country"
"His sense of smell failed him this time"
"His strength finally failed him"
"His children failed him in the crisis"
"She cheats on her husband"
"Might her husband be wandering?"
"He told on his classmate who had cheated on the exam"
"The insurance company deceived me when they told me they were covering my house"
I will never forgive Eleanor. She has betrayed my confidence.
出自： E. M. Forster
I had betrayed David, broken my promise.
出自： R. Macaulay
He betrayed nervousness by stammering.
He was once betrayed into error.
She was betrayed into a snare.
He betrayed the news to all his friends.
For years, they betrayed Britain's secrets to Russia.
Her trembling hands betrayed her nervousness to him.