pljeskati

1. to applaud; to clap
   Publika je dugo pljeskala posle koncerta. — The audience clapped for a long time after the concert.
   Deca pljeskaju u ritmu pesme. — The children are clapping to the rhythm of the song.
2. (against a surface) to slap; to splash
   Klinac pljeska rukama po vodi i smeje se. — The kid is slapping the water with his hands and laughing.

In Serbia aplaudirati or tapšati is more usual for “to applaud”; the person applauded is in the dative.