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Phrase(s): keep the ball rolling
1. Lit. to keep a rolling ball moving. • You have to throw hard enough to keep the ball rolling all the way to the bowling pins. 2. Fig. to cause something that is in progress to continue. • Tom started the project, and we kept the ball rolling. • Who will keep the ball rolling now that she is gone?
McGrawhill's American Idioms And Phrasal Verbs