go into action

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go into action

To begin doing something or become active suddenly and very quickly. Firefighters need to be able to go into action at a moment's notice. If any movement is detected once this sensor is activated, the building's security measures will go into action.
See also: action, go

go into action

 and swing into action
to start doing something. I usually get to work at 7:45, get some coffee, and I go into action at 8:00. When the ball is hit in my direction, you should see me swing into action.
See also: action, go