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.

Definitions of betray
  1. verb
    deliver to an enemy by treachery
    “The spy betrayed his country”
    synonyms: sell
    give up for a price or reward
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    double cross
    betray by double-dealing
    type of:
    cozen, deceive, delude, lead on
    be false to; be dishonest with
  2. verb
    disappoint, prove undependable to; abandon, forsake
    synonyms: fail
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    type of:
    disappoint, let down
    fail to meet the hopes or expectations of
  3. verb
    cause someone to believe an untruth
    synonyms: deceive, lead astray
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    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
    type of:
    misinform, mislead
    give false or misleading information to
  4. verb
    give away information about somebody
    synonyms: denounce, give away, grass, rat, shop, snitch, stag, tell on
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    sell out
    give information that compromises others
    type of:
    impart knowledge of some fact, state or affairs, or event to
  5. verb
    reveal unintentionally
    “Her smile betrayed her true feelings”
    synonyms: bewray
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    type of:
    break, bring out, disclose, discover, divulge, expose, give away, let on, let out, reveal, unwrap
    make known to the public information that was previously known only to a few people or that was meant to be kept a secret
  6. verb
    be sexually unfaithful to one's partner in marriage
    synonyms: cheat, cheat on, cuckold, wander
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    carry on a romantic relationship with two people at the same time
    fool around, play around
    commit adultery
    type of:
    cozen, deceive, delude, lead on
    be false to; be dishonest with
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