Definitions for knock on
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Princeton's WordNet
knock on(noun)
(rugby) knocking the ball forward while trying to catch it (a foul)
Wiktionary
knock on(Verb)
to commit a foul by knocking the ball forward.
Citation
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"knock on." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/knock on>.

