Definition of betray verb from the Oxford Advanced American Dictionary

betray

verb
/bɪˈtreɪ/
 
 
1 to give information about someone or something to an enemy betray someone/somethingHe was offered money to betray his colleagues. betray someone/something to someoneFor years they had been betraying state secrets to Russia.2 betray someone/something to hurt someone who trusts you, especially by not being loyal or faithful to themShe felt betrayed when she found out the truth about him.She betrayed his trust over and over again.I have never known her to betray a confidence (= tell other people something that should be kept secret).3 betray something to ignore your principles or beliefs in order to achieve something or gain an advantage for yourselfHe has been accused of betraying his former socialist ideals.4 to tell someone or make them aware of a piece of information, a feeling, etc., usually without meaning to synonym give away betray somethingHis voice betrayed the worry he was trying to hide. betray yourselfShe was terrified of saying something that would make her betray herself (= show her feelings or who she was).
Usage noteUsage note: cheatlie trick fool deceive betray conThese words all mean to make someone believe something that is not true, especially in order to get what you want.cheat to make someone believe something that is not true, in order to get money or something else from them: She cheated on her taxes. I was cheated out of my fair share.note Cheat also means to act in a dishonest way in order to gain an advantage, especially in a game, competition, or exam: Copying someone else's answers is one kind of cheating.lie to say or write something that you know is not true: He lied about his age. Don't lie to me.trick to make someone believe something that is not true, especially in a skillful way, in order to get what you want: She tricked him into handing over all his savings.fool to make someone believe something that is not true, especially in order to laugh at them or to get what you want: Just don't be fooled by these statistics.deceive to make someone believe something that is not true, especially someone who trusts you, in order to get what you want: I don't know how he deceived me so well.betray to hurt someone who trusts you, especially by deceiving them or not being loyal to them: She felt betrayed when she found out the truth about him.con (informal) to deceive someone, especially in order to get money from them or get them to do something for you: My grandfather was conned out of $10,000 by criminals.which word?Many of these words involve making someone believe something that is not true, but some of them are more disapproving than others.Deceive is probably the worst because people typically deceive friends, relations, and others who know and trust them. People may feel cheated/betrayed by someone in authority whom they trusted to look after their interests. If someone cheats/tricks/fools/cons you, they may get something from you and make you feel stupid. However, someone might fool you just as a joke; and to trick someone is sometimes seen as a skillful thing to do, if the person being tricked is seen as a bad person who deserves it.patternsto cheat/trick/fool/con someone out of somethingto fool/trick/con someone into doing somethingto feel cheated/tricked/fooled/deceived/betrayed/connedto fool/deceive yourselfto cheat/trick/con your way into something
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