istopiti

1. to melt
   Istopi maslac na tihoj vatri. — Melt the butter over low heat.
   Sunce je za dva dana istopilo sav sneg. — The sun melted all the snow in two days.
2. (istopiti se) to melt
   Sladoled se istopio dok smo stigli kući. — The ice cream melted before we got home.
3. (istopiti se, of money, supplies) to melt away; to dwindle
   Ušteđevina mu se istopila za godinu dana. — His savings melted away within a year.
4. colloq. (istopiti se, of a person) to lose a lot of weight
   Istopio se posle bolesti, jedva sam ga prepoznao. — He lost so much weight after his illness that I barely recognized him.

In the intransitive sense ('to melt' without an object) it takes se: sneg se istopio.