progovarati

1. (of a child or silent person) to begin to talk; to start speaking
   Naš sin tek progovara, zna samo par reči. — Our son is just starting to talk; he knows only a few words.
   Posle dugog ćutanja, on polako progovara. — After a long silence, he slowly starts to speak.
2. (+ o + loc.) to speak out about; to address
   Ovaj film progovara o nasilju u porodici. — This film addresses domestic violence.
   Sve više žena javno progovara o tome. — More and more women are speaking out about it publicly.

The perfective is progovoriti.