speak of the devil
idiomE

Used when someone appears just after being mentioned
  • 1We were just talking about you, and speak of the devil, here you are!
  • 2I was mentioning her skills, and speak of the devil, she walked in.
When we say "speak of the devil," it means that the person we were just talking about has suddenly shown up. It's like a funny coincidence. It's a way to express surprise or amusement when someone appears right after we were discussing them.
Card
Remember, "speak of the devil" is informal. In more formal situations, you can say "talk of the devil" instead. Just a small change in wording can make a big difference in tone.
at the showroom
Surprise Visit
Barbara
I was just telling Karen about how helpful Tom was last time.
Karen
Yes, Tom really knows his stuff when it comes to cars.
Barbara
Oh, speak of the devil, here he comes now!
Karen
Perfect timing, we could use his advice again.
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