Where Did the Expression “As Clear As a Bell” For Something Obvious Originate and What Does it Mean?

In a simpler time when birds could be heard above traffic or construction noise, a single clear note sounded by a church bell could be heard over a wide area.

The bell was used to communicate time, to announce a celebration or important event, or even to warn of an impending attack.

When the bell sounded, everyone heard the message as clear as a bell.