swing into action

Idioms  

1. 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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Example Sentences

Memory B cells are one of those layers, cells that live for years in the bone marrow, ready to swing into action and produce more antibodies when needed.

From Seattle Times • Jan. 2, 2022

But your body will detect them and think an infection is underway, prompting the immune system to swing into action, Pride said.

From Los Angeles Times • Dec. 14, 2021

Studies indicate that glia, the cells that nurture neurons in the CNS, swing into action in response to damage to peripheral nerves.

From Scientific American • Oct. 10, 2021

The video was captioned, “Spider-Man will soon swing into action above Avengers Campus opening this summer at Disney California Adventure Park.”

From Fox News • Feb. 4, 2020

The city’s emergency broadcast system, which was supposed to swing into action during a crisis, did not go on the air because "the Sunday-morning staff did not know how to operate the equipment."

From "A Short History of Nearly Everything" by Bill Bryson