play a big role (in something)

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play a big role (in something)

To have an extremely important or fundamental role (in some resultant situation, action, event, outcome, etc.). There were a lot of reason why I quit, but having to work 10 hours a day played a big role. Punk rock played a big role in forming my aesthetic sensibilities. The rookie quarterback ended up playing a big role in the team's amazing comeback victory yesterday.
See also: big, play, role