Meaning of new ball in English:

new ball

Pronunciation /ˌnjuː ˈbɔːl/

noun

Sport
  • A previously unused ball, specifically (a) (with the) one brought into use in cricket at the beginning of an innings or available for the fielding side to use after a prescribed number of overs; (b) (in plural) a set of balls brought into use in a tennis match after a prescribed number of games.

Origin

Early 20th century; earliest use found in E. M. Forster (1879–1970), novelist and essayist. From new + ball.