naglasiti

1. to emphasize; to stress
   Direktor je naglasio da rok ne može da se pomeri. — The director stressed that the deadline can't be moved.
   Želim da naglasim jednu važnu stvar. — I want to emphasize one important thing.
2. (of appearance) to accentuate; to highlight
   Naglasila je oči tamnom olovkom. — She accentuated her eyes with a dark pencil.
3. (of a syllable, word) to stress; to accent
   U ovoj reči treba naglasiti prvi slog. — In this word you should stress the first syllable.

The imperfective is naglašavati; often followed by a clause: naglasiti da…