Definition of: betray

(bi·trā′) v.t.
1. To deliver up to an enemy; be a traitor to.
2. To prove faithless to; disappoint: to betray a trust.
3. To disclose, as secret information.
4. To reveal unwittingly: to betray ignorance.
5. To deceive; seduce and desert.
6. To indicate; show: The smoke betrays a fire. See synonyms under DECEIVE. [ME bitraien <bi over, to + OF trair <L tradere deliver, give up]
—be·tray′al, be·tray′ment noun
—be·tray′er noun