ˈback ˌstory BrE AmE noun [countable]
the things that happened to a character in a book or film before the beginning of the story being told in the book or film:
The back story of why she hates her father is a bit too contrived.
ˈback ˌstory BrE AmE noun [countable]
the things that happened to a character in a book or film before the beginning of the story being told in the book or film:
The back story of why she hates her father is a bit too contrived.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012