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ancient history
/ˈeɪnʃənt hˈɪstɚɹi/
/ˈeɪnʃənt hˈɪstəɹˌi/
Ancient history
01
a history of the ancient world
02
knowledge of some recent fact or event that has become so commonly known that it has lost its original pertinence
03
something that occurred a long time ago and is now considered irrelevant or unimportant
Informal
Examples
That argument we had is ancient history, so let's not bring it up again.
His past mistakes are ancient history now that he ’s completely changed his ways.
