I have the best teacher. 
I agree with @salep , dushman is a word widely used in serbo-croatian (or vice versa) language, meaning, as he said, angry enemy. It can be found in a popular culture of folkish singers from late 80’s walking down through Sarajevo “Nek puknu dusmani” (dusmans may envie us)
Juzni vetar - Nek puknu dusmani
only for those with strong heart…
