The antonyms for the phrase "put out of commission" could include "activate," "enable," "mobilize," "operate," "power up," or "prepare for use." These words suggest the opposite of disabling or decommissioning, and instead imply readiness and function. Other antonyms could include "repair," "restore," "rejuvenate," or "revive," which suggest a process of renewal or restoration. These antonyms speak to the idea of bringing something back into operation or working order, rather than taking it out of service. In short, the antonyms of "put out of commission" suggest action, vitality, and productivity, as opposed to dormancy or inactivity.