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English definition of “Fort Knox”

Fort Knox

noun     /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.Fortifications
(Definition of Fort Knox noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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