Definition of might-have-been noun from the Oxford Advanced American Dictionary

 

might-have-been

 noun
noun
NAmE//ˈmaɪt̮ əv ˌbɪn//
 
[usually plural](informal)
 
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an event or situation that could have happened or that you wish had happened, but that did not happen Superstar status remained a might-have-been for her. I am not concerned with the might-have-beens but with the facts.
See the Oxford Advanced Learner's Dictionary entry: might-have-been