: to perform or assume the chief role : bear the major portion of work or responsibility
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carry the ball
US informal : to have the responsibility for doing something
No one else is available to make the arrangements, so it's up to you to carry the ball.
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Main Entry: ↑ball
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Main Entry: ↑carry
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carry the ˈball idiom
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My co-worker was sick, so I had to carry the ball.
Useful english dictionary. 2012.