Anything from the past that isn't significant or important anymore.
This is used in the context when something unimportant of the past is referred.
Sample Usage
1)Marks of my eighth class is considered as water under the bridge.
2)The day of our office building crash is regarded as water under the bridge now.
3)My past achievements are now considered as water under the bridge.
4)My fight with Albert is now water under the bridge.
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