As a Noun: 1. The action of hitting someone on the hand with the palm side of your hand. 2. The action of hitting someone with the palm side of your hand. English = slap, smack. As a Verb or Adjective: 1. To hit someone (especially a child) on the hand with the palm side of your hand, when they are reaching to do something or take something and you want them to stop; to slap or smack someone on the hand; to rap someone over the knuckles. 2. To hit someone (especially a child) with the palm side of your hand in an attempt to stop them doing something or to punish them. English = slap, smack.