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at sea
at sea (2) {adj. phr.}
Не представляющий что делать; растерянный; потерянный.
The job was new to him, and for a few days he was at sea.
When his friends talked about chemistry, Don was at sea, because he did not study chemistry.
Ср.: AT A LOSS.
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Источник: A Dictionary of American Idioms
