ˌprime ˈmover BrE AmE noun [countable]
1 . someone who helps to make something happen and has great influence in the way it develops
prime mover in/of/behind
He was a prime mover in the bid to get better pay for West Indian cricketers.
She was a prime mover of social change in the 19th century.
2 . Prime Mover a way of referring to God