The term "put in gear" typically implies starting or turning on something, but its antonyms can encompass a range of related or opposite meanings. Some antonyms for "put in gear" include "turn off," "shut down," "disconnect," or "deactivate." These words suggest a cessation or interruption of activity or power. Other antonyms could include "unplug," "dismantle," "disable," or "disassemble," all indicating a process of removing or taking apart. Finally, "Put in neutral" can also be considered an antonym, indicating that something is not actively engaged or moving forward. Depending on context, different antonyms may be more appropriate, highlighting different aspects of the process of "putting in gear.