osvećivati

1. (osvećivati se + dat.) to take revenge; to get back at
   Ona mu se osvećuje ćutanjem. — She's getting back at him with silence.
   Godinama se osvećivao komšiji za staru svađu. — For years he kept taking revenge on his neighbor for an old quarrel.
2. (+ acc.) to avenge
   U filmu junak osvećuje ubijenog brata. — In the film the hero avenges his murdered brother.
3. (in a church rite) to consecrate; to bless
   Sveštenik osvećuje vodu na Bogojavljenje. — The priest blesses the water on Epiphany.
   Vladika ove nedelje osvećuje novu crkvu. — The bishop is consecrating the new church this Sunday.

Construction: osvećivati se kome (dat.) za šta (acc.); the perfective is osvetiti. In the sense 'to consecrate' the perfective is osvetiti or osveštati; the imperfective synonym is osveštavati.