prepoloviti

1. to halve; to cut in half
   Prepolovi jabuku i daj mi pola. — Cut the apple in half and give me half.
2. (of amounts) to halve; to cut by half
   Firma je prepolovila broj zaposlenih. — The company halved its number of employees.
   Cena karata je prepolovljena za studente. — Ticket prices have been halved for students.

The imperfective is prepolovljavati.