Meaning of on the ball in English on the ball idiom Add to word list aware of any changes or developments and quick to react to them: We need someone who’s really on the ball to answer questions from the press.
to change the rules while someone is trying to do something in order to make it more difficult for them: We'd almost signed the contract when the other guys moved the goalposts and said they wanted more money.
a situation in which everyone has the same chance of succeeding: If the tax systems are different in each European country, how can industries start on a level playing field?
to complete an activity successfully or to produce a good result, especially when you were not expected to: John's uncle came up trumps, finding us a place to stay at the last minute.