Definition of golden rule noun from the Oxford Advanced American Dictionary

     

    golden rule

     noun
    noun
     
    [usually singular]
     
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  1. 1an important principle that should be followed when doing something in order to be successful The golden rule in tennis is to keep your eye on the ball.
  2. 2Golden Rule a principle that states that you should treat others in the same way that you want them to treat you
See the Oxford Advanced Learner's Dictionary entry: golden rule