slap

1. waterfall
   Reka se tu survava niz stenu u visoki slap. — There the river plunges down the cliff in a tall waterfall.
   Do slapa se ide pešačkom stazom kroz šumu. — A footpath through the forest leads to the waterfall.
2. (of water, wind, feelings) gush, surge, wave
   Zapljusnuo ga je slap hladne vode. — A gush of cold water splashed over him.
   Preplavio ju je slap uspomena iz detinjstva. — A wave of childhood memories swept over her.

In Serbia the usual word for a waterfall is vodopad; slap in that sense sounds literary or Croatian, but in the meaning 'gush, wave' (slap vode, slap osećanja) it is used freely.