Water under the bridge is an idiom that means something that happened in the past and is no longer important or a source of concern. It implies that a lot of time has passed and the situation has changed since the event. It is often used to say that a problem has been resolved or forgiven. For example, “We had a fight last year, but that’s water under the bridge now.”
The origin of this idiom is not very clear, but some sources suggest that it comes from an ancient Greek proverb that says “the past is like water that flows under the bridge”. This means that the past cannot be changed or retrieved, so it is better to focus on the present and the future. Another possible source is a French expression that says “that’s water under the bridge of Avignon”, which refers to the famous bridge in southern France that crosses the Rhone river. The expression means that something is irrelevant or insignificant, just like the water that flows under the bridge.
