There are 2 definitions of knock up in English:

knock up1

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

Definition of knock up in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up

There are 2 definitions of knock up in English:

knock-up2

Line breaks: knock-up

noun

British
(In tennis or other racket sports) a period of practice play, especially before formal play begins.
More example sentences
  • The final decision was deferred until after a final practice session today, but a light knock-up with Courteau confirmed her worst fears and Mauresmo sat courtside in the Rod Laver Arena with her head buried in a towel.
  • I have been playing more squash recently and in the knock-up I again felt confident and was pulling off shots that surprised and impressed me for their accuracy and technique.
  • Don't get me wrong, I enjoy a knock-up on the courts.