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English definition of “knock up”

knock up

phrasal verb with knock     /nɒk/ US  /nɑːk/ verb
Players knock up before beginning a game of tennis or similar sport by hitting the ball to each other: The players have a couple of minutes to knock up before the match starts.Tennis and racket sports
(Definition of knock up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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