Guess the meaning of this idiom.
"Speak of the devil"
The idiom "Speak of the devil" is used when someone appears unexpectedly while others are talking about them. It usually implies that the person mentioned in the conversation shows up just as they are being discussed, in a coincidental manner.
Complete the following task based on the instruction and optional input provided.### Instruction:
Guess the meaning of this idiom.

### Input:
"Speak of the devil"

### Output:
The idiom "Speak of the devil" is used when someone appears unexpectedly while others are talking about them. It usually implies that the person mentioned in the conversation shows up just as they are being discussed, in a coincidental manner.