be like Fort Knox

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
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.