keys
n. countable A1 Beginner US //ˈkiz// UK //kˈiːz// keys
n. small metal tools used to open locks or start a car engine. You usually keep them on a ring so you do not lose them.
n. small, shaped pieces of metal designed to operate the bolt of a lock. Often used metonymically to refer to the entire set of instruments required for access to a property or vehicle.
I cannot find my car keys anywhere.
She fumbled with her keys in the dark before finally finding the one for the front door.
The landlord handed over the keys to the apartment, marking the official transfer of the property to the new tenants after months of legal negotiations.
Usage
Usually used in the plural when referring to a set of tools for different locks.