To hit someone with an open hand

To make a sound like a slap

चपकी ध्वनि करना

English Usage: The water slapped against the side of the boat.

Hindi Usage: पानी नाव के किनारे पर चपकी ध्वनि कर रहा था।

An act of hitting someone or something with an open hand

चपत लगाना

English Usage: He gave his friend a playful slapping on the back.

Hindi Usage: उसने अपने दोस्त को मजाक में पीठ पर चपत लगाई।