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on the ball

on the ball

 
See:
ball
part of speech: phrase
definition 1: acting with efficiency and competence.
I've always found her to be a reliable employee and always on the ball.
synonyms:
capable, competent, efficient, quick
similar words:
fit
definition 2: alert to one's surroundings; aware.
When we take the children to the museum, we have to stay on the ball the whole time.
synonyms:
alert, attentive, aware
similar words:
agile, clearheaded, observant