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kill two birds with one stone

Преуспеть в выполнении двух дел одним действием; получить оба результата при одном усилии.
Mother stopped at the supermarket to buy bread and then went to get Jane at dancing class; she killed two birds with one stone.
The history teacher told us that making an outline kills two birds with one stone; it makes us study the lesson till we understand it, and it gives us notes to review before the test.
Категории: study {v. phr.}