Definição e Significado de "water under the bridge"

What is the origin of the idiom "water under the bridge" and when to use it?

The idiom "water under the bridge" originated from the metaphorical concept of water flowing beneath a bridge and moving away from the observer. It signifies that a past event or issue has been resolved, forgiven, or forgotten, and it should no longer be a source of concern or contention. The phrase is used to convey the idea that the past is in the past, and it is not worth dwelling on or holding onto grudges or regrets.