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English definition of “mole”

mole

noun [C] (PERSON)    /məʊl/ US  /moʊl/
a person who works for an organization or government and secretly gives information to its competitor or enemy: A mole inside the Department of Transport had leaked secret proposals to the press. → Compare spy nounSpying and espionage
(Definition of mole noun (PERSON) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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