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Closed book
01
livro fechado, mistério
someone or something one knows very little or nothing about
Idiom
Informal
Exemplos
The reclusive scientist was a closed book to his colleagues – he rarely interacted with them and never shared his work.
O cientista recluso era um livro fechado para seus colegas – ele raramente interagia com eles e nunca compartilhava seu trabalho.
