ancient history
idiomPart ofhistory
ancient history — idiom
1. an event or situation that happened so long ago that it is no longer relevant or
1.idiom
Definition
an event or situation that happened so long ago that it is no longer relevant or worth discussing.
Example
Trang and Sora dated years ago, but that is ancient history now.
The team's loss last season is ancient history — they are focused on winning now.