Synonyms of 'betray'
to hand over or expose (one's nation, friend, etc.) treacherously to an enemyHe might be seen as having betrayed his mother.
be disloyal to,
grass on (British, slang),
dob in (Australian, slang),
They were frightened of being double-crossed.
stab in the back,
be unfaithful to,
sell down the river (informal), ,
shop (slang, mainly British),
Fraudsters are often shopped by honest friends and neighbours.
put the finger on (informal),
inform on or against, ,
be treacherous to
to disclose (a secret or confidence) treacherouslyShe studied his face, but it betrayed nothing.
The facts tell a very different story.
She had enough time to show her gratitude.
She has refused to reveal her daughter's whereabouts.
After the scandal was exposed, he moved abroad.
clapboard façades that revolve to disclose snug interiors
Auditors said they had uncovered evidence of fraud.
He's only convincing when that inner fury manifests itself.
He was charged with divulging state secrets.
Elliott unmasked the master spy and traitor.
lay bare, ,
He had never, hitherto, evinced any particular interest in economic matters.
To betray, you must first belong
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in the sense of desert
to abandon (a person or place) without intending to returnHe deserted our team years ago.
in the sense of disclose
to allow to be seenclapboard façades that revolve to disclose snug interiors
in the sense of divulge
to make knownHe was charged with divulging state secrets.
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Video: pronunciation of 'betray'
Thesaurus for betray from the Collins English Thesaurus