to untie; to undo; to loosen or open a knot, button, or bundle

small bell; a hollow metal object that makes a sound when hit or shaken; an electronic device that makes a ringing sound such as a doorbell or phone

expressing realization or discovery that a certain fact remains true after consideration or comparison

Originally referring to the person who tied a bell around a tiger's neck; used to describe the person who caused a problem or created a conflict. Often used in the phrase 解铃还须系铃人 jiě​líng​hái​xū​xì​líng​rén.