Pronunciation: /fɔrt nɑks/
noun a synonym for a place or thing that is heavily guarded or secure
A1 Fort Knox is a famous gold reserve in the United States.
A2 Tourists can visit Fort Knox to learn about its history and see the gold vaults.
B1 Fort Knox is heavily guarded to protect the valuable assets stored inside.
B2 The security measures at Fort Knox are so strict that very few people are allowed access.
C1 Fort Knox is often used as a metaphor for something that is extremely secure or well-protected.
C2 The security at Fort Knox is so tight that it is considered one of the most secure locations in the world.
formal Fort Knox is a highly secure United States Army post located in Kentucky.
informal I heard Fort Knox is nearly impossible to break into.
slang That place is like Fort Knox, good luck getting in without the right code.
figurative Her heart was like Fort Knox, guarded and impenetrable.
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