Fort Knoxnoun
uk/ˌfɔːt ˈnɒks/us/ˌfɔːrt ˈnɑːks/humorousbe like Fort Knox
If a building or an area is like Fort Knox, it is impossible to enter or leave it because it is so well protected.
Thesaurus: synonyms and related words
Fortifications
- acropolis
- barricade
- bastion
- battlements
- castle
- citadel
- drawbridge
- earthwork
- enceinte
- entanglement
- fort
- foxhole
- keep
- moat
- moated
- pillbox
- portcullis
- rampart
- stronghold
- turret
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