razjasniti

1. to clear up; to clarify
   Moramo da razjasnimo ovaj nesporazum. — We need to clear up this misunderstanding.
   Policija još nije razjasnila slučaj. — The police haven't solved the case yet.
2. (to someone) to explain
   Razjasnio mi je kako sistem funkcioniše. — He explained to me how the system works.

The reflexive razjasniti se means to become clear: Sve se razjasnilo.