swing into action
Energetically start doing something, as in Come on, let's swing into action before the others arrive. This idiom uses swing in the sense of “move vigorously.”
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.