noun a synonym for a place or thing that is heavily guarded or secure
Fort Knox is a United States Army post located in Kentucky that is home to the United States Bullion Depository, which stores a large portion of the country's gold reserves.
Fort Knox is often used metaphorically to refer to a place that is highly secure or impenetrable, similar to the level of security at the actual Fort Knox.
Fort Knox is synonymous with high levels of security and protection, making it a common reference in discussions about secure facilities or systems.
The writer described the protagonist's emotions as being as guarded as Fort Knox.
The psychologist likened the patient's traumatic memories to a vault in Fort Knox, difficult to access.
The financial analyst compared the security measures of the investment firm to those of Fort Knox.
The security guard was trained to protect the building as securely as Fort Knox.
The government official referred to the classified documents as being stored in a digital Fort Knox.
The jeweler stored the valuable gems in a safe as secure as Fort Knox.