背叛者,叛国贼
Betrayer \Be*tray"er\, n. One who, or that which, betrays.
betrayer n 1: one who reveals confidential information in return for money [syn: {informer}, {rat}, {squealer}, {blabber}] 2: a person who says one thing and does another [syn: {double-crosser}, {double-dealer}, {two-timer}, {traitor}]