what’s done is done
don’t worry about the past, especially past mistakes or grievances
to forget past differences and conflicts
let the unpleasant occurrences of the past be forgotten
ignore a past offence and reconcile
allow past disagreements or arguments to be forgotten
let the unpleasantness be a thing of the past
The two international rivals shook hands and agreed to let bygones be bygones.
They decided to let bygones be bygones and made peace with each other.
I feel we should let bygones be bygones and move on to the more important things.
Though your first attempt was a failure, you would do well to let bygones be bygones and move ahead in your endeavour.
The two neighbours had always been quarreling, but they finally shook hands and decided to let bygones be bygones when they met at a local event.
Let’s put all the bitterness behind and let bygones be bygones; we’ll make a fresh start and try all over again.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.