열쇠들을 하나로 묶어 보관하기 위해 사용하는 작은 사슬이나 고리.
A small chain or ring used for holding keys together, often with a decorative item attached.
예문:
"She attached a small flashlight to her keychain so she could see the lock at night."
"He lost his entire set of house keys because the ring on his keychain snapped."