1 place (a person, one's country, etc.) in the hands or power of an enemy.
2 be disloyal to (another person, a person's trust, etc.).
3 reveal involuntarily or treacherously; be evidence of (his shaking hand betrayed his fear).
4 lead astray or into error.
Derivatives:
betrayal n. betrayer n.
Etymology: ME f. obs. tray, ult. f. L tradere hand over
Useful english dictionary. 2012.