be on the ball

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be on the ball

slang To be attentive, knowledgeable, and quick to take action. I'm so glad that my assistant is always on the ball because I'm too scatterbrained to manage my schedule on my own. I can't believe Molly got that report done so quickly—she's really on the ball.
See also: ball, on

be on the ˈball

be aware of what is happening and be able to react or deal with it quickly: For the assistant manager’s job we need someone who’s really on the ball.
See also: ball, on