polomiti

1. (of objects) to break; to smash
   Deca su polomila sve igračke za jedan dan. — The kids broke all the toys in one day.
   Vetar je polomio grane u dvorištu. — The wind broke the branches in the yard.
2. (of a body part) to break; to fracture
   Polomio je nogu na skijanju. — He broke his leg skiing.
3. colloq. (of a person) to beat up; to thrash
   Ako ga uhvate, polomiće ga. — If they catch him, they'll beat him up.
4. colloq. (polomiti se) to make a great effort; to work extremely hard; to wear oneself out
   Polomio sam se od posla ove nedelje. — I wore myself out at work this week.
   Polomio se da nam pomogne. — He bent over backwards to help us.

Compared with slomiti, polomiti often stresses that several things were broken or something was broken into pieces.