simple past tense and past participle of knock in

(obsolete, Oxford University slang) To enter college after hours—after half-past ten at night when the doors have been locked.

present participle of knock in

(card games, archaic) The game of lanterloo.

plural of knocking

A suburb and ward in Belfast, Northern Ireland. / A townland in Drumcliff civil parish, County Clare, Ireland. / A town and civil parish of County Mayo, Ireland, location of the Knock Shrine.

(transitive, intransitive, rugby) To commit a foul by knocking the ball forward.

(US) Of a warrant, raid, etc.: allowing police to enter a property without immediate prior notification of the residents, as by knocking or ringing a doorbell.

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).