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1. noun In rugby, an infringement in which the ball is hit forward with the hand or arm and strikes the ground or another player, whether deliberately or unintentionally. The referee awarded the other team a scrum when the captain committed a knock-on while trying to receive the ball from his teammate.
2. verb In rugby, to commit a knock-on. Often spelled without the hyphen. The crowd jeered after the scrum-half had clearly knocked-on when clearing the ball from the ruck.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
knock on something
to rap or tap, often with the knuckles, on something. (See also knock on wood.) She knocked on the door several times. Knock on it again. Maybe she didn't hear you.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.