KILL TWO BIRDS WITH ONE STONE

v. phr. 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.