I think this idiom probably has some variation in at least a few languages. I know you can say the same thing in French… Do you know any languages where this idiom would work?
For those of you who are unfamiliar with it, it tends to be used as a stand alone phrase. For example, you’re talking about your friend Betsy and in she comes, you might say: Ah, speak of the devil!
It’s usually preceeded by some kind of expression of surprise, like: ah; oh; oh hey, etc.
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