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 ...

A house key or residential door key will have a code like "LR-2" or "SR-1" on the head. Take the key to a hardware store and ask the key maker if they know what the letter and number designation on the key signifies. Keys usually are coded by type of lock they fit and this could identify old keys.