One of the mysteries of the English language finally explained.
(in a racket game) practise before formal play begins.
warm up, practise, have a practice game, hit a ball aroundView synonyms
- ‘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 idea came when they were knocking up one day last June on the grass courts at Roehampton.’
- ‘The players are on court and are knocking up.’
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