Third-person singular simple present indicative form of knock on the head

One of a class of childish jokes told as a dialog, and usually including a pun, in the following form:

An arrangement between multiple insurance companies in which each company pays the losses incurred by its own policyholders in an event, regardless of who was at fault (now rarely used outside of motor insurance).

plural of knock-knock joke

Alternative spelling of knock-knock joke

plural of knock knock joke

Synonym of knock down ginger (“prank of knocking on a front door and running away”)

plural of knock-for-knock agreement

(idiomatic, chiefly US) The source of an education consisting of real-world experiences, especially adverse experiences.

plural of school of hard knocks