Japanese · Daily Life
kagi
Key / Lock
A device for opening a lock, also referring to the lock itself. Japanese apartment life relies heavily on key management, and smart locks are increasingly popular.
家の鍵を忘れてしまいました。
I forgot the house key.
'鍵' (kagi) stems from Classical Chinese and has been retained in its current form to denote a physical lock and key mechanism since historical times.
'鍵' (kagi) is commonly used in informal and formal settings in both spoken and written forms to refer to keys and the concept of security.