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English definition of “Fort Knox”

Fort Knox

noun 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.Fortifications
(Definition of Fort Knox from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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