1. to turn on someone you trust, or to have someone do the same to you.
2. team-killing, i.e. in a FPS. More specifically, this is the term used when one team-kills in Halo/Halo 2.
1. i had the worst betrayal the other day, when my best friend whom i thought i trusted stole my girlfriend.
2. Halo announcer: "Lost the lead! BETRAYAL!"
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