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betray

be·tray [ bi tráy ] (past and past participle be·trayed, present participle be·tray·ing, 3rd person present singular be·trays)


transitive verb 
Definition:
 
1. help enemy: to harm or be disloyal to a country or another person by helping an enemy or giving information that is confidential

2. surrender somebody or something treacherously: to deliver somebody or something to an enemy
He betrayed his own brother to the secret police.

3. go against promise: to act in a way that is contrary to a promise made

4. reveal something: to show something, often unintentionally
She said nothing, but her bright eyes betrayed her excitement.

[13th century. <be1 + Old French trair< Latin tradere "hand over"]

be·tray·al noun
be·tray·er noun
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