knock in

1. archaiccard gamesThe game of lanterloo.

   "Do you feel inclined to have a knock in for an hour?" said Charles, addressing Tom. "I don't understand much of the game." […] He was seldom indeed without two good trumps, and therefore almost invariably loo'd those who stood.

   1847, Henry Cockton, The Love Match, page 232

present singular third person knocks in · participle present knocking in · participle past knocked in · past knocked in

1. obsoleteOxford University slangTo enter college after hours—after half-past ten at night when the doors have been locked.

   There's twelve striking. I must knock in. Good night. You'll be round to breakfast at nine?

   1861, Thomas Hughes, Tom Brown at Oxford, London: Macmillan and Co., published 1883, page 458

   2 more examples

   "Close the oak, Jem," said Horace Eglantine, "and take care no one knocks in before we have knocked down the contents of your master's musical melange."

   1825, Charles Molloy Westmacott, The English Spy, page 138

   At first, too, he was on such occasions greatly alarmed at finding the gates of Brazenface closed, obliging him thereby to "knock-in;" and not only did he apologize to the porter for troubling him to open the wicket, but he also volunteered elaborate explanations of the reasons that had kept him out after time[…]

   1861, Edward Bradley, The Adventures of Mr. Verdant Green

2. transitiveball gamesTo pot (a ball)
3. transitiveball gamesTo score (a break)

   With the tension rising Brecel knocked in a timely 51 to leave himself on the brink of victory, which he confirmed with a stylish 112 break.

   2023 May 1, Steve Sutcliffe, “World Snooker Championship 2023 final: Luca Brecel beats Mark Selby for first world title”, in BBC Sport