What is "master keys"

Usage examples of "master keys".

As an afterthought I asked her to use her set of master keys and check each locker on the odd possibility that the caskets weren't taken off the premises.

He used his master keys and passed inside, switching on the light as he went in.

Then I laughed, and got Khys's own master keys from his library, where they were hidden with his charts and precious writings.

They heard a door close softly, and he reappeared with a brass ring the size of a knitting hoop, containing all the master keys.

After trying his master keys on the bag, he adjusted his machine to the proper pattern, and clamped in a blank to cut.

We think they bought master keys for Saturns from some kid named Beeper, supposedly in the area of Swansboro Elementary School on Midlothian Turnpike.

I delivered it a few times, learned where he kept his master keys, found the one tagged for Owlsden and, when he was out of the shop, stole in and made myself a few duplicates.

I added hard black shoes left over from my days on traffic detail with the Santa Teresa Police Department, tacked on a self-important key ring with a long chain, and grabbed up a clipboard, my key picks, and a set of master keys.