doing something without thinking about how or why you do it All the actors in this play seemed to be operating on automatic pilot, and none of them was very good.
Usage notes: also used in the form on autopilot with the same meaning: I was so tired, I was simply running on autopilot.
if you are on automatic pilot, or do something on automatic pilot, you do something without thinking about what you are doing, usually because you have done it many times before By the second week of the election campaign she was making all her speeches on automatic pilot.