To kill two birds with one stone is to finish two tasks with a single action. Kill two birds with one stone, that kills two birds with one stone, a chance to kill two birds with one stone.
It is always said with satisfaction about an efficiency somebody noticed. The phrase appears in a letter of 1646, and there is an older English version about stopping two gaps with one bush.
1phrasekill two birds with one stoneTo finish two tasks with a single action.
“I'll pick up the bread on my way to the gym and kill two birds with one stone.”
kill two birds with one stone is an efficiency.
Apparently coined in a letter of 1646; an older English form spoke of stopping two gaps with one bush.
Apparently coined by Dr. John Bramhall, Bishop of Derry, in a 1646 letter to Thomas Hobbes, later published in 1656. Compare earlier stop two gaps with one bush.
Etymology from Wiktionary, CC BY-SA
Practised in Idioms