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prime mover [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 nineteenth century.
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 nineteenth century.