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English definition of “knock-up”

knock-up

noun [C usually singular]     /ˈnɒk.ʌp/ US  /ˈnɑːk-/
a short time before the start of a game of tennis or a similar sport when players practise by hitting the ball to each other: Shall we have a quick knock-up before the game?
(Definition of knock-up noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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