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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
speak of the devil
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "speak of the devil" is a correct and usable phrase in written English.
This phrase is typically used when someone arrives unexpectedly or if you have been talking about them and they appear. It can be used in a variety of situations. For example, "We were just talking about you. Speak of the devil!".
✓ Grammatically correct
News & Media
Wiki
Alternative expressions(20)
who should appear but
right on cue
out of the blue
as it turned out
would you believe
surprisingly
unexpectedly
to my surprise
as luck would have it
who would have thought
in a surprising turn of events
it so happened
and then
suddenly
who else but
guess who showed up
look who came
none other than
it could only be
speaking of the devil
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
22 human-written examples
Speak of the devil.
News & Media
And speak of the devil!
News & Media
Speak of the devil — he marches through the door, and becomes apoplectic when he learns of the upheaval.
News & Media
3.09pm: Speak of the devil: Aaron Porter has just been interviewed on BBC News, he said that the violence at Millbank Tower was "absolutely not" the plan.
News & Media
(The prolific Gilbert has also been writing and drawing manic "adaptations" of nonexistent potboiler B-movies, including last year's "Chance in Hell," the recently serialized "Speak of the Devil" and the forthcoming volume "The Troublemakers").
News & Media
"If the character is smug, bitchy, trashy or has dubious morals, call me!" And – speak of the devil – in the West End transfer of Richard Bean's phone-hacking play Great Britain, she takes over from Billie Piper as a power-crazed tabloid editor.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
38 human-written examples
It was touched off by a woman named Ann Cole, who began having "fits" in which she shook and spoke of the devil, according to an account by a Hartford minister included in the book "Witch-Hunting in Seventeenth-Century New England". Seventeenth-Century New England
News & Media
The pope has spoken of the devil a number of times as a real entity, not as simply a representation of evil.
News & Media
"Everybody is suffering from the schedule," said Brodeur, speaking of the Devils' fatigue.
News & Media
Now, turning to the man on his right, he began to speak of the white devils with whom I had last appeared on TV: What had they made him (me) feel?
News & Media
Blatter, alone on the press conference podium at Fifa headquarters, spoke of "all the devils who are in this game".
News & Media
Expert writing Tips
Best practice
Use "speak of the devil" when someone you were just talking about suddenly appears, creating a humorous or ironic effect.
Common error
Avoid using "speak of the devil" in serious or somber situations where humor would be inappropriate. The phrase is best suited for lighthearted or casual settings.
Linguistic Context
The phrase "speak of the devil" functions as an interjection or idiom. Ludwig confirms that it's a recognized expression used when someone appears shortly after being mentioned in conversation. It is a way to acknowledge the coincidence, often humorously.
Frequent in
News & Media
60%
Wiki
20%
Reference
10%
Less common in
Academia
2%
Science
4%
Formal & Business
4%
Ludwig's WRAP-UP
In summary, "speak of the devil" is a common and correct idiom used when someone appears unexpectedly after being mentioned. As Ludwig confirms, this expression serves to acknowledge the coincidence, often with a touch of humor. While the phrase is grammatically sound and frequently used in news and media, it's best suited for informal or neutral contexts. Alternatives include "talk of the devil" or more literal descriptions depending on the situation.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
Talk of the devil
A more concise variation with identical meaning.
As soon as we mention him
Highlights the timing aspect of someone's arrival after being discussed.
Just when we were talking about you
Highlights the coincidence of the person's arrival.
Look who's here
A direct, less idiomatic way to acknowledge someone's arrival.
The person we were just discussing
A literal description of the situation.
And here they are
Emphasizes the unexpected appearance.
If you say his name
Suggests that mentioning someone's name conjures their presence.
Who should appear but
A more formal or literary phrasing.
Out of nowhere
Highlights the unexpectedness of the person's arrival
It's like a spell
Implies the act of conjuring a person's presence by speaking of them.
FAQs
How can I use "speak of the devil" in a sentence?
You can use "speak of the devil" when someone you were just talking about appears unexpectedly. For example, if you're complaining about a friend's tardiness and they walk in, you could say, "Well, "speak of the devil", you're finally here!"
What does "speak of the devil" actually mean?
The phrase "speak of the devil" is an idiom used when a person appears just after being talked about. It's a way to acknowledge the coincidence, often with a humorous or slightly surprised tone.
Are there any alternatives to "speak of the devil"?
Yes, you can use alternatives like "talk of the devil", or a more literal description like "Just when we were talking about you!" depending on the context.
Is "speak of the devil" formal or informal?
"Speak of the devil" is generally considered informal and is best used in casual conversations. It might be inappropriate in very formal or professional settings.
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