Мы в Telegram на канале Учим Английский
at it
at it {adj. phr.}
занятый (поглощённый) каким-л. делом; работающий над чем-л.; активный.
His rule for success was to keep always at it.
The couple who owned the little cleaning shop were at it early and late.
Mr. Curtis heard a loud crash in the next apartment — the neighbors were at it again.
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Источник: A Dictionary of American Idioms
