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give away information about somebody
e.g. He told on his classmate who had cheated on the exam
Synonym: denounce tell on give away rat grass shit shop snitch stag
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cause someone to believe an untruth
e.g. The insurance company deceived me when they told me they were covering my house
Synonym: deceive lead astray
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reveal unintentionally
e.g. Her smile betrayed her true feelings
Synonym: bewray
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disappoint, prove undependable to
abandon, forsake
e.g. His sense of smell failed him this time
e.g. His strength finally failed him
e.g. His children failed him in the crisis
Synonym: fail
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deliver to an enemy by treachery
e.g. Judas sold Jesus
e.g. The spy betrayed his country
Synonym: sell
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be sexually unfaithful to one's partner in marriage
e.g. She cheats on her husband
e.g. Might her husband be wandering?
Synonym: cheat on cheat cuckold wander