1. to do two things by one action; to get two results with just one effort

1. At the library, Niko can kill two birds with one stone. He does his schoolwork and sees his friends.

2. We can kill two birds with one stone by dropping off the mail when we go to the grocery store.

3. Both of these problems are solved with similar tools, killing two birds with one stone.

4. John learned the new words while peeling potatoes. He was killing two birds with one stone.