Wiktionary
start the ball rolling
vb. (alternative form of get the ball rolling English)
Usage examples of "start the ball rolling".
Had she known his address she would have written him a line of apology for her behaviour, and so tried to start the ball rolling between them again that way, but she did not.
He still needs me to start the ball rolling outside this Montana Mecca.
Ah, well, this is a good way to start the ball rolling, I suppose.
Andine's going to kneel down in front of Gelta, and that's your signal to start the ball rolling.
All he could do was start the ball rolling and take advantage of what opportunity offered.
To start the ball rolling, perhaps beyond the ability of the Moffs or even Thrawn to easily stop it.