huk

1. (of water, wind, engines) roar; rumble; howl
   Čuo se huk vodopada iza drveća. — The roar of the waterfall could be heard behind the trees.
   Celu noć je trajao huk vetra. — The wind howled all night.
2. (of an owl) hoot
   U šumi se čuo huk sove. — An owl's hoot could be heard in the forest.

Usually followed by the genitive of the source: huk vode, huk motora.