it's a long story Definition in the Cambridge English Dictionary
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Definition of “it's a long story” - English Dictionary

Definition of "it's a long story" - British English Dictionary

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it's a long story

something that you say when someone has ​asked you about something that has ​happened and you do not ​want to ​explain it to them because it would take too long: "So why was Carlo ​knocking on ​yourdoor at ​midnight?" "It's a long ​story."
(Definition of it's a long story from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)