[Idiom] UNDER LOCK AND KEY. - Securing Valuables and Information
Under lock and key.
Securely locked up
When something is 'Under lock and key,' it means it is securely locked or well protected. This could be used literally, like when valuable jewelry is kept in a safe, or figuratively, such as confidential information being secured within a company. This phrase emphasizes the safety and security measures taken to protect something from being stolen or accessed by unauthorized individuals.
Example Sentences
The important documents are kept under lock and key.
The important documents are securely stored.
He felt safer knowing the valuables were under lock and key.
He felt more secure knowing the valuables were safely stored.
All the classified information is under lock and key in the secure facility.
All the classified information is securely kept in a safe facility.