naglašavati

1. to emphasize; to stress
   Lekar stalno naglašava koliko je važan san. — The doctor keeps stressing how important sleep is.
   Ministar je više puta naglašavao da nema razloga za paniku. — The minister repeatedly emphasized that there was no reason to panic.
2. (of looks, clothes) to accentuate; to highlight
   Ova haljina lepo naglašava struk. — This dress nicely accentuates the waist.
3. (in pronunciation) to stress; to accent
   Stranci često pogrešno naglašavaju srpske reči. — Foreigners often stress Serbian words wrongly.

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