posedeti

1. (of hair, a person) to go gray
   Otac mi je posedeo za godinu dana. — My father went gray within a year.
   Posedela je još pre tridesete. — She went gray before she was thirty.
2. to sit for a while
   Posedeli smo malo kod komšija pa otišli kući. — We sat at the neighbours' for a while and then went home.
   Hajde da posedimo negde na kafi. — Let's sit down somewhere for a coffee.

The two meanings differ in accent: posédeti "to go gray", pòsedeti "to sit for a while".