kill two birds with one stone

To succeed in doing two things by only one action; get two results from one effort.
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.
Categories: study verb

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