opasač

1. belt
   Vojnik je zategao opasač i krenuo. — The soldier tightened his belt and set off.
   Na pantalonama je nosio širok kožni opasač. — He wore a wide leather belt on his trousers.
2. (medical) truss; support belt
   Posle operacije lekar mu je preporučio opasač. — After the surgery the doctor recommended a support belt.

In everyday speech kaiš is more common; opasač sounds more formal and often refers to a uniform belt.