idiom. Add to word list Add to word list. locked away safely: Her jewelry is securely under lock and key at the bank. If a person, especially a criminal, is under lock and key, they are being kept in a place from which they cannot escape, usually a prison.

For doors, experts recommend grade 1 deadbolts for security. Durability and Materials: The material used in a lock affects its durability and strength. Opt for locks crafted from materials like brass or steel for longevity.

Lock and key jewellery, or the lock necklace – whereby a lock and key is combined into a charm, is used to signify a secured (and sometimes, secret) love connection: One half of the lock-and-key set is kept by each partner to maintain a feeling of connection – even when both partners are (or have to be) physically ...

The key serves as a security token for access to the locked area; locks are meant to only allow persons having the correct key to open it and gain access. In more complex mechanical lock/key systems, two different keys, one of which is known as the master key, serve to open the lock.