The idiom “on the
ball” generally means to be alert, active, or attentive. If you say someone
is “on the ball”, you mean that he or she understands the situation well.
For Example:
“If I had been
more on the ball I would have asked when he called me”
This is the Idiom #4 in the List of 100 commonly used Idioms in everyday English (Top 100 famous Idioms). By introducing this list of notable idioms to English learners and ESL students as you, we believe that your English will sound more like a native and you can easily understand what native speakers are saying. Please like and share this list with your friends if you think it is helpful - the full list is here.