get the ball rolling

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get the ball rolling [idiom]

to cause something to initiate/start

Also: keep/set/start the ball rolling

get the ball rolling
Example: 

Let’s get the ball rolling and tidy up the mess, we have a few hours before the guests arrive.

Cambridge Advanced Learner's Dictionary

start / set / get the ball rolling 

to do something that starts an activity, or to start doing something in order to encourage other people to do the same:

I decided to set the ball rolling and got up to dance.

Cambridge Advanced Learner's Dictionary - 4th Edition
© Cambridge University Press 2013