Definition of knock up in English:

knock up

  • British informal (In a racket game) practise before formal play begins.
    More example sentences
    • The idea came when they were knocking up one day last June on the grass courts at Roehampton.
    • She knocks up with England's seventh seed Elena Baltacha and recently had the chance to play doubles with British number one Tim Henman when he visited the sports centre.
    • The players are on court and are knocking up.
    Synonyms
    warm up, practise, have a practice game, hit a ball around
See parent entry: knock

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