When you betray someone or something, you provide information whether you mean to do it or not, like the loud growling of your stomach that betrays your hunger or the secret you tell about your friend that betrays her trust.
When you betray someone or something, you reveal something, like a secret or your true feelings. You may betray your impatience, for example, if you sit at your desk tapping your fingers. There is another meaning of betray that is just the opposite: lie. You betray your friend if you pretend that something is true just to trick him into doing what you want. In this case, betray means the same thing as deceive.
v cause someone to believe an untruth
free from deception or illusion
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impersonate, personate, pose
pretend to be someone you are not; sometimes with fraudulent intentions
bamboozle, hoodwink, lead by the nose, play false, pull the wool over someone's eyes, snow
conceal one's true motives from especially by elaborately feigning good intentions so as to gain an end
befool, cod, dupe, fool, gull, put on, put one across, put one over, slang, take in
fool or hoax
pretend to be someone or something that you are not
kid, pull the leg of
tell false information to for fun