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1. Engaged in some activity. I think it's important to for students to see different businesses in action, so they get a sense of how things work when they leave school.
2. Having resumed a previous activity, especially after illness or injury. I need to take today off to deal with this cold, but I should be back in action on Monday.
in ˈactionworking, operating, etc.; doing a particular activity: John’s a great cook — you should see him in action.
1. mod. healthy and getting around. After I got well, I was in action again immediately.
2. mod. selling or using drugs. (Drugs.) In this neighborhood, somebody is in action twenty-four hours a day.