Word:

on the ball

alert; competent and knowledgeable.

See also: Ball

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On one's legs
on one's own
On one's own account
On one's own hook
on paper
On penalty of
on purpose
on request
On shore
On sufferance
on tap
on that
on that point
on the air
on the alert
on the average
-- on the ball --
On the beam
on the books
On the bow
on the button
On the cards
on the coattails
on the coattails of
on the contrary
On the docket
on the dole
on the dot
On the European plan
on the face of it
on the far side
on the fence
on the fly
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