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on call
on call {adj. phr.}
1. Оплачиваемый по требованию.
Jim didn't have the money ready even though he knew the bill was on call.
2. На дежурстве, в распоряжении.
This is Dr. Kent's day to be on call at the hospital.
The nurse is on call for emergency cases.
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Источник: A Dictionary of American Idioms
