opomenuti

1. to reprimand; to caution
   Sudija ga je opomenuo zbog grubog starta. — The referee cautioned him for a rough tackle.
   Profesorka nas je opomenula da ne pričamo na času. — The teacher told us off for talking in class.
2. to remind; to warn
   Mama me je opomenula da ponesem kišobran. — Mom reminded me to take an umbrella.

Usually opomenuti koga (acc.) zbog čega or da + verb.