Antonyms for the phrase "put out of action" could include words and phrases that indicate the opposite of disabling or incapacitating something or someone. These might include activating, energizing, enabling, empowering, reinforcing, invigorating, strengthening, revitalizing, or rejuvenating. While the phrase "put out of action" typically implies taking something out of commission or rendering it inoperable, these antonyms suggest a return to functioning or a state of increased effectiveness. For example, instead of putting your car out of action by letting it sit idle all winter, you might take steps to activate and reinforce it with regular maintenance, winter tires, or a battery charger.