zapušiti

1. (an opening, a pipe) to plug; to cork; to clog
   Zapuši flašu čepom. — Put the cork back in the bottle.
   Kosa je zapušila odvod u kupatilu. — Hair has clogged the bathroom drain.
2. colloq. (of a cigarette or the habit) to light up; to take up smoking
   Izašao je napolje da zapuši cigaretu. — He went outside for a smoke.
   Zapušio je još u srednjoj školi. — He took up smoking back in high school.

The reflexive zapušiti se means "to get clogged": zapušila se sudopera; zapušen nos is a blocked nose.