Meaning of “master key” in the English Dictionary

british dictionary

"master key" in British English

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master keynoun [ C ]

uk /ˈmɑː.stə ˌkiː/ us /ˈmæs.tɚ ˌkiː/

a key that can be used to open any of several different locks

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

"master key" in American English

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master keynoun [ C ]

us /ˈmæs·tər ˈki/

a key that can be used to open a number of different locks

(Definition of “master key” from the Cambridge Academic Content Dictionary © Cambridge University Press)

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