You use long-lost to describe someone or something that you have not seen for a long time.
...finding a long-lost sixth century manuscript.
ADJ : ADJ n
You use long-lost to describe someone or something that you have not seen for a long time.
...finding a long-lost sixth century manuscript.
ADJ : ADJ n
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006