Rap on knuckles and Zapper

Zapper and rap on knuckles are semantically related in verbal disapproval topic. In some cases you can use "Zapper" instead a noun phrase "Rap on knuckles".

Zapper noun - An electrical device that can injure or kill by means of electric currents.

Rap on knuckles and zapper are semantically related in verbal disapproval topic. Sometimes you can use "Rap on knuckles" instead a noun "Zapper".