gužvati

1. (+ acc.) to crumple; to crease
   Nemoj da gužvaš košulju, tek sam je ispeglala. — Don't crease the shirt, I've just ironed it.
   Nervozno je gužvao papir u ruci. — He was nervously crumpling the paper in his hand.
2. (gužvati se, of fabric) to wrinkle; to crease
   Lan se brzo gužva, ali je prijatan leti. — Linen creases easily, but it's nice in summer.
3. colloq. (gužvati se, of people) to jostle; to be crammed together
   Svako jutro se gužvamo u autobusu. — Every morning we're crammed together on the bus.

The perfective counterpart is zgužvati.