The idiom speak of the devil means that the person you were just talking about suddenly appears. It is usually said in a light or joking way when someone arrives at the moment they are mentioned.
The phrase comes from an older saying speak of the devil and he shall appear. In the past it was a superstition that mentioning the devil might cause him to appear.
The phrase comes from an older saying speak of the devil and he shall appear. In the past it was a superstition that mentioning the devil might cause him to appear.
We were just wondering where Sam was, and speak of the devil, here he comes now.