People who betray someone by revealing secrets, breaking trust, or helping their enemies.
From Old French 'betraïr,' from 'be-' plus 'traïr' (to betray), ultimately from Latin 'tradere' meaning to hand over or deliver. The '-er' suffix marks the agent noun.
Betrayal is one of humanity's oldest sins, and the word 'betray' literally means 'to hand over'—which is why Judas's betrayal of Jesus with a kiss was so powerful: he literally handed him over to enemies.
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