kažnjavati

1. to punish; to penalize
   Roditelji ga nikad nisu kažnjavali zbog loših ocena. — His parents never punished him for bad grades.
   Sudija strogo kažnjava svaki prekršaj. — The referee strictly penalizes every foul.
2. (with money) to fine
   Saobraćajna policija kažnjava vozače koji pričaju telefonom. — Traffic police fine drivers who talk on the phone.

Construction: kažnjavati koga zbog čega / za šta (someone for something).