Definition of knock up in English:

knock up

phrasal verb

British
informal
  • (in a racket game) practise before formal play begins.

    • ‘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.’
    • ‘The idea came when they were knocking up one day last June on the grass courts at Roehampton.’
    warm up, practise, have a practice game, hit a ball around
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