širiti

1. (of rumours, disease, smell) to spread
   Ne širi glasine ako nisi siguran. — Don't spread rumours if you're not sure.
   Virus se brzo širi po gradu. — The virus is spreading quickly through the city.
2. (of a street, business) to widen; to expand
   Opština širi ulicu ispred škole. — The municipality is widening the street in front of the school.
   Firma stalno širi posao na nova tržišta. — The company keeps expanding its business into new markets.
3. (of arms, wings) to spread; to open wide
   Deca su širila ruke i trčala prema nama. — The children spread their arms and ran towards us.

For 'to spread, to expand' on its own the verb takes se: miris se širi.