začep

1. Croat. (medicine) constipation
   Beba ima začep već tri dana. — The baby has been constipated for three days.
2. Croat. (in a pipe or duct) blockage; obstruction
   Majstor je očistio začep u odvodu. — The plumber cleared the blockage in the drain.
3. Croat. (for a bottle or opening) stopper; plug
   Izvadio je začep iz boce i nasuo vino. — He pulled the stopper out of the bottle and poured the wine.

In Serbia constipation is zatvor (the usual word in Croatia too, where začep is an alternative), a blockage is začepljenje, and a stopper is čep or zapušač.