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English definition of “knock-up”

knock-up

noun [C usually singular] uk   /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: Let's have a quick knock-up before the game.
(Definition of knock-up noun from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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