swing into action
To begin some activity with great enthusiasm, intensity, and speed. The boss swung into action as soon as he learned there was a dispute between the two departments. I'm going to meet with my group on Saturday so we can swing into action on this project.
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."
ˌswing into ˈaction
start to act efficiently and quickly: When the police heard about the bomb, they swung into action, searching the area with dogs and moving the public to safety.