Where does “сржи” come from?

сржи (Macedonian) comes from Macedonian ’ржи, from Proto-Slavic *rъzati, from Proto-Indo-European rewǵ-, from Proto-Indo-European rew- — to roar, growl, grumble; to roar; growl; grumble;...

сржи (Macedonian): to growl (especially at someone)