Fort Knox Meaning in the Cambridge English Dictionary
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Meaning of “Fort Knox” in the English Dictionary

"Fort Knox" in British English

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Fort Knoxnoun

uk   /ˌfɔːtˈnɒks/  us   /ˌfɔːrtˈnɑːks/ humorous
be like Fort Knox If a ​building or an ​area is like Fort Knox, it is ​impossible to ​enter or ​leave it because it is so well ​protected.
(Definition of Fort Knox from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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