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Longman Dictionary of Contemporary English
key ring
noun
EXAMPLES FROM CORPUS
▪ He had to fumble in it for some seconds before his fingers found the key ring.
▪ Other good features include a spare bulb in the tail cap and a useful key ring facility.
▪ Sebastian Nocon got a huge key ring with the letter S on it from Fergie.
▪ She rummaged in her handbag for the key on its wooden key ring and tried to fit it into the lock.
WordNet
key ring

n. a circular ring of metal for holding keys

Wikipedia
Key Ring (software)

Key Ring is a smartphone application owned by Gannett, Inc. that allows users to digitally store loyalty cards, enroll in new loyalty programs, receive localized offers on their smartphone, browse weekly sales circulars, and create digital shopping lists.

Usage examples of "key ring".

The guard, wild, grabbed for the sergeant's key ring, but the sergeant slapped him down.

Frank agreed, ambling inside and twirling the key ring on his finger.

He unlocked the car with the automatic lock release on the key ring and they got in.

Look, I've got a can of pepper spray in my purse and a whistle on my key ring.

Beside the box was the ransom note, key ring, driver's license, pen, even the crumpled pieces of torn newspaper that had been used for packing.