Longman Dictionary of Contemporary English homepage

automatic pilot

 noun
     
Related topics: Air
automatic pilot [uncountable and countable]
1TTA a machine that flies a plane by itself without the need for a pilot
2

be on automatic pilot

to do something without thinking about it, especially because you have done it many times before:
Moving on automatic pilot, she tidied the room.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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