Question

start the ball rolling / keep the ball rolling Let’s start the ball rolling by calling on our first guest.

Accepted Answer

If you start the ball rolling, you begin an activity in which other people will join. If you keep the ball rolling you maintain the momentum of an activity.

Phrase/Idiom	start the ball rolling / keep the ball rolling
Definition	If you start the ball rolling, you begin an activity in which other people will join. If you keep the ball rolling you maintain the momentum of an activity.
Example	Let’s start the ball rolling by calling on our first guest.

Ball Rolling Start Begin Activity People Join Maintain