Where does “коштац” come from?

коштац (Serbo-Croatian) comes from Serbo-Croatian koštati, from Italian costare, from Latin constō, from Proto-Italic komstaēō.

Definitions

Step	Language	Word	Meaning
1	Serbo-Croatian	koštati	to cost
2	Italian	costare	to cost
3	Latin	constō	—
4	Proto-Italic	komstaēō	—

коштац — Etymology, Origin & Word History | Etymology Explorer