master key Meaning in Cambridge American English Dictionary
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Meaning of "master key" - American English Dictionary

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master keynoun [C]

 us   /ˈmæs·tər ˈki/
a key that can be used to open a number of different locks
Translations of “master key”
in Chinese (Traditional) 萬能鎖匙…
in Chinese (Simplified) 万能钥匙…
(Definition of master key from the Cambridge Academic Content Dictionary © Cambridge University Press)
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