top secret
idiomPart ofsecret
top secret — idiom
1. the highest level of secrecy, used especially for government or military informa
1.idiom
Definition
the highest level of secrecy, used especially for government or military information that could endanger national security if revealed
Example
The documents were marked top secret and locked in a special safe in the basement.
Only four government officials knew the top secret location of the emergency shelter.