be like Fort Knox

be like Fort Knox

To be inaccessible, usually because the item or place in question is locked or guarded. Fort Knox is a military site in Kentucky where stores of gold are kept. The kids are home by themselves, but don't worry, the house is like Fort Knox with all the security cameras. I can't get into the safe, it's like Fort Knox!
See also: fort, like
References in periodicals archive ?
Last night, Burley said: "There will not be a third time because my house is going to be like Fort Knox.
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