American English

Definition of Fort Knox noun from the Oxford Advanced American Dictionary

 

Fort Knox

 noun
noun
NAmE//ˌfɔrt ˈnɑks//
 
 
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Idioms
be like/as safe as Fort Knox
 
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(of a building) to be strongly built, often with many locks, strong doors, guards, etc., so that it is difficult for people to enter and the things kept there are safe This home of yours is like Fort Knox. From the name of the military base in Kentucky where most of the U.S.'s store of gold is kept.
See the Oxford Advanced Learner's Dictionary entry: Fort Knox