The antonyms for the phrase "being in commission" include being out of commission, being inactive, being out of operation, being disused, being retired, being decommissioned, or being malfunctioning. Being in commission refers to the state of being operational and available for use, while being out of commission suggests that something is not functioning or is unavailable for use. This can apply to various things such as equipment, systems, machines, vehicles or anything that has been designed to perform a specific task. When something is in commission, it is a sign of productivity and efficiency, while being out of commission can cause delays, hinder productivity or cause inconvenience.