master key

Found in Anh - Anh (Wordnet)

Definition Noun : A key that opens many different locks : A single key designed to open a set of locks, typically within a specific building or system, providing access to multiple areas. Usage The noun "master key" refers to a physical key or a digital/electronic equivalent that grants broad access. It is used to describe a key held by a person in authority (like a building manager or head cus...