C2 [C] a quick hit with the flat part of the hand or other flat object: She gave her son a slap for behaving badly.Hitting and beatingPunishing by causing pain a slap in the face C2 informal › an action that insults or upsets someone: It was a real slap in the face for him when she refused to go out to dinner with him.Insults and abuseTreating people or animals badly a slap on the back › the action of hitting someone in a friendly way on the back in order to show praise for something they have done: He's won - give him a slap on the back.Praising and applaudingExaggerating and playing down a slap on the wrist informal › a gentle warning or punishment: The judge gave Minna a slap on the wrist for not wearing her seat belt.Punishing and punishmentsPunishing by causing painHitting and beatingThreats and warnings