Learn English – Why “Speak of the devil”

expressionspopular-refrains

Why is the expression "Speak of the devil" and not "Speaking of the devil"? For me, the -ing would make more sense because you're currently talking about someone, when he/she appears.

For example, if you're talking about something, and that subject made you remember something else, you would say something like:

Speaking of groceries, I have to go to the supermarket in an hour.

but you wouldn't say:

Speak of groceries, I have to go to the supermarket in an hour.

Best Answer

"Speak of the devil" is the short form of the idiom "Speak of the devil and he doth appear".

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