Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb be_on_the_ball

1 sense of be on the ball

Sense 1
know the score, be with it, be on the ball, know what's going on, know what's what -- (be well-informed)
       => know -- (know how to do or perform something; "She knows how to knit"; "Does your husband know how to cook?")