Tradução - Japonês-Inglês - 裏切り者！死ね！

é so o significado

Romanized
Uragiri-mono! Shinè!

Japanese usually has no plural form, so it may equally be translated into English as
Traitors! Die!

Traitor
literally means
One who cuts in behind
i.e. in English, "backstabber"

PS: I myself did this translation into Japanese before, and you could have saved yourself 9 points if you had looked at the notes under that one! ^-^