be·tray 
/bɪˈtreɪ/ verb
be·trays; be·trayed; be·tray·ing /bɪˈtreɪ/ verb [+ obj] 1 : to give information about (a person, group, country, etc.) to an enemy
▪ They betrayed their country by selling its secrets to other governments. ▪ He was betrayed (to the authorities) by one of his students. 2 : to hurt (someone who trusts you, such as a friend or relative) by not giving help or by doing something morally wrong
▪ She is very loyal and would never betray a friend. ▪ He betrayed his wife with another woman. [=he was unfaithful to his wife] ▪ She betrayed her own people by supporting the enemy. ▪ I felt betrayed. [=I was hurt because someone betrayed me] ▪ You've betrayed our trust. [=we trusted you, but you did something very bad and hurt us] ▪ I can't believe you lied to me. I feel as if you've betrayed our friendship. [=you've betrayed me; you've treated me in a way that shows you are not really my friend] 3 a : to show (something, such as a feeling or desire) without wanting or trying to
▪ Although he would not smile, his eyes betrayed his happiness. [=his eyes showed that he was happy] ▪ She coughed, betraying her presence behind the door. ▪ The expression on his face betrayed nothing. [=the expression on his face did not show anything about what he was feeling or thinking]
b : to reveal (something that should not be revealed)
▪ betray a secret 4 : to do something that does not agree with (your beliefs, principles, etc.)
▪ He felt that he would be betraying his principles if he accepted the money.
▪ They betrayed their country by selling its secrets to other governments. ▪ He was betrayed (to the authorities) by one of his students.
▪ She is very loyal and would never betray a friend. ▪ He betrayed his wife with another woman. [=he was unfaithful to his wife] ▪ She betrayed her own people by supporting the enemy. ▪ I felt betrayed. [=I was hurt because someone betrayed me] ▪ You've betrayed our trust. [=we trusted you, but you did something very bad and hurt us] ▪ I can't believe you lied to me. I feel as if you've betrayed our friendship. [=you've betrayed me; you've treated me in a way that shows you are not really my friend]
▪ Although he would not smile, his eyes betrayed his happiness. [=his eyes showed that he was happy] ▪ She coughed, betraying her presence behind the door. ▪ The expression on his face betrayed nothing. [=the expression on his face did not show anything about what he was feeling or thinking]
b : to reveal (something that should not be revealed)
▪ betray a secret
▪ He felt that he would be betraying his principles if he accepted the money.
— be·tray·al /bɪˈtrejəl/ noun, plural be·tray·als
[count] ▪ She divorced her husband after his betrayal (of her). [=after he had betrayed her] ▪ He felt that accepting the money would be a betrayal of his principles. [noncount] ▪ acts of betrayal ▪ feelings of anger, helplessness, and betrayal
/bɪˈtrejəl/ noun, plural be·tray·als [count] ▪ She divorced her husband after his betrayal (of her). [=after he had betrayed her] ▪ He felt that accepting the money would be a betrayal of his principles. [noncount] ▪ acts of betrayal ▪ feelings of anger, helplessness, and betrayal
— be·tray·er /bɪˈtrejɚ/ noun, plural be·tray·ers [count]
▪ a betrayer of his people
/bɪˈtrejɚ/ noun, plural be·tray·ers [count] ▪ a betrayer of his people
