be like Fort Knox

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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

be like Fort Knox

  (humorous)
if a building or an area is like Fort Knox, it is very difficult to enter or leave it because it is so well protected
Usage notes: Fort Knox is the building where the United States keeps its supplies of gold.
Our house is like Fort Knox with all these extra security locks.
See also: fort, like