Мы в Telegram на канале Учим Английский
sit up and take notice
sit up and take notice {v. phr.}, {informal}
Весьма удивляться услышанной новости.
Grace had never impressed her teachers. Hearing that she had won the essay contest made them sit up and take notice.
George's sudden success made the town sit up and take notice.
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Источник: A Dictionary of American Idioms