driving force behind (something)

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driving force behind (something)

The primary instigator, catalyst, or motivator that compels or directs something to happen. Major financial losses were the driving force behind the layoffs. He dreamed of being a driving force behind changes in his country's government someday.
See also: behind, driving, force
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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