čep

1. cork; stopper; cap; plug
   Ne mogu da izvučem čep iz flaše vina. — I can't get the cork out of the wine bottle.
   Zavrni čep da se sok ne prospe. — Screw the cap on so the juice doesn't spill.
2. (also of a traffic jam) plug; blockage
   Lekar mi je izvadio čep iz uha. — The doctor removed a wax plug from my ear.
   Na autoputu se napravio saobraćajni čep dug deset kilometara. — A ten-kilometre traffic jam formed on the motorway.

Earplugs are čepići za uši.