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Definition of gold mine noun from the Oxford Advanced Learner's Dictionary

gold mine

noun
 
/ˈɡəʊld maɪn/
 
/ˈɡəʊld maɪn/
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  1. a place where gold is dug out of the ground
  2. a business or an activity that makes a large profit
    • This restaurant is a potential gold mine.
See gold mine in the Oxford Advanced American Dictionary
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