What does it mean when someone says theyve apologized, but "under the bridge"?

Question

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Answer 1

could they be refering to " i have apologized and NOW it's water under the brifge?" in other words they have forgotten about it already.

Answer 2

water under the bridge means whatever has happened is over and you should forget about it and start fresh.

Answer 3

If they said something like, "it's all water under the bridge", then they're basically saying it's all in the past and that it doesn't matter anymore.

Answer 4

just like the water under a bridge the problem has passed... it is over with and forgotten