Definition of golden rule noun from the Oxford Advanced Learner's Dictionary


golden rule

BrE BrE//ˌɡəʊldən ˈruːl//
; NAmE NAmE//ˌɡoʊldən ˈruːl//
[usually singular]
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an 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.
See the Oxford Advanced American Dictionary entry: golden rule