The idiom to 'kill two birds with one stone' means to achieve multiple results or aims from a single action or behaviour. When you 'kill two birds with one stone' you save time and resources by achieving your aims with one action or a small amount of effort. This is a popular expression used in both social and professional contexts.

1. We can kill two birds with one stone by picking up the kids on the way to do the shopping. That will save a lot of hassle.
2. I was in Dublin on business, so I thought I'd kill two birds with one stone and visit my grandmother while I was there.

1. Rather than have two separate meetings, the boss of the company killed two birds with one stone by setting up a video link with the supplier while he was in a meeting with the manufacturer.