What is it?
It’s a conjugation of “betray” in Portuguese.
Are we stuck?
Raire is irregular (3rd group) in French 
Edit: I don’t know what that has to do with it, I must have been confused
Trair (Portoguese too)
Traíras
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I think travire and / or tramire is Latin. Not sure. I can look it up. Oh wait, there’s still the s. Not convinced they have that.
We can continue with “trairas” (conjugation of the verb “traire” in French).
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That’s what I said too, thinking to Portuguese though.
Hint
Traira
Trairais
You like to make things complicated 
Trairait
Trahirait
Trahirais
Trahira
(Sorry for edit but had to )
Trahir
No no no last not good (2 letters less)
OK then Trahirai
Trahira
Now “trahir” works.
Trahit
Trait