Meaning of “coal mine” in the English Dictionary

(Definition of “coal mine” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"coal mine" in American English

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coal minenoun [ C ]

/ˈkoʊl ˌmɑɪn/

a deep hole or connected long narrow openings under the ground from which coal is removed

(Definition of “coal mine” from the Cambridge Academic Content Dictionary © Cambridge University Press)