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In Irish Gaelic:
feall (deceit, treachery, let-down)
brath (betrayal, spying)
meabhlú (deception, betrayal; seduction)
brathadóireacht (act of betraying, betrayal)
In Scottish Gaelic:
brathadh (betrayal, treason)
feall (deceit, betrayal)
The symbol of betrayal is typically the dagger.
The Betrayal - film - was created in 1948.
Betrayal at Krondor happened in 1993.