Fort Knox
A place which is very difficult to get into.
After the security upgrades, the facility was essentially Fort Knox.
fort
UK /fɔɹt/ US /fɔɹt/
noun 4name 2verb 1
Definitions
noun
1
A fortified defensive structure stationed with troops.
2
Any permanent army post.
3
An outlying trading-station, as in British North America.
4
A structure improvised from furniture, bedding, etc., for playing games.
The kids built a fort out of chairs and pillows.
verb
1
To create a fort, fortifications, a strong point, or a redoubt.
name
1
A surname.
2
A district of Colombo, Sri Lanka.
Your note
not saved0 chars