Definition of knock up in English:

knock up

phrasal verb

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

    • ‘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.’
    • ‘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.’
    warm up, practise, have a practice game, hit a ball around
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