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Từ điển Oxford Advanced Learner 8th
unheard-of
unheard-of [unheard-of] BrE [ʌnˈhɜːd ɒv] NAmE [ʌnˈhɜːrd ʌv] adjective
that has never been known or done; very unusual
•He'd dyed his hair, which was almost unheard-of in the 1960s.
•It is almost unheard-of for a new band to be offered such a deal.
Example Bank:
•At that time, it was completely unheard-of for girls to go to university.
•He was sentenced to a hitherto unheard-of seven life terms in prison.
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