kill two birds with one stone
Formskills two birds with one stone, killing two birds with one stone, killed two birds with one stone
- 1To finish two tasks with just one action.
Like throwing one ball and knocking down two cans at the same time.
By biking to work, I kill two birds with one stone, since I save money and stay fit.
She killed two birds with one stone by dropping off the mail on her way to the store.
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Origin
This phrase seems to have been first used by Dr. John Bramhall, Bishop of Derry, in a 1646 letter to Thomas Hobbes, which was published in 1656.