To kill two birds with one stone means to solve two problems at one time with a single action.
To accomplish two tasks with only one effort.
To succeed in achieving two things in a single action.
1. While I was on business in NYC, I thought I’d kill two birds with one stone and visit my best friend from high school.
2. On the way to the bank, I thought I’d kill two birds with one stone and pick up some groceries.
3. I killed two birds with one stone and met up with friends while I was in Paris visiting my Grandmother.
4. Why don’t you come to the market with me, we’ll kill two birds with one stone.
able, active, beneficial, clever, effective, organised, productive, profitable, rewarding, skilful, useful, valuable, well-organised, worthwhile