Evidence status: WELL SUPPORTED
Most idioms disappear into linguistic fog when you chase their beginnings. This one leads instead to a furious playwright, a failed production and a theatrical sound effect that proved more successful than the play it was invented for.
The Short Answer
To “steal someone’s thunder” is to take another person’s idea, attention or moment of glory for yourself.
The expression is traditionally traced to the English playwright and critic John Dennis.
In 1709, Dennis staged his tragedy Appius and Virginia at the Theatre Royal, Drury Lane. For the production he devised or improved a theatrical technique for creating convincing thunder.
The play failed.
The thunder did not.
When Dennis later heard the effect being used in another production — traditionally identified as Macbeth — he reportedly complained that the theatre would not keep his play but was happy to steal his thunder.
The wording varies between later accounts, but the central story is unusually well documented.
What We Know
John Dennis was a real playwright, critic and sometimes combative figure in early eighteenth-century London literary life.
His Appius and Virginia was performed at Drury Lane in 1709 and was unsuccessful.
What people remembered was its thunder.
Later biographical accounts describe Dennis developing a new or improved method of producing stage thunder. After his own play disappeared from the programme, the theatre continued using the effect.
Dennis then heard his theatrical thunder during another performance and protested.
An eighteenth-century version records him complaining, in essence, that the theatre would not let his play run but would steal his thunder.
A nineteenth-century Encyclopaedia Britannica biography repeats the same core account: Dennis’s play failed, his effective thunder was reused in Macbeth, and he angrily accused the theatre of stealing it.
How It Became a Habit
At first, the theft was literal.
Someone had taken Dennis’s theatrical effect and used it elsewhere.
But the phrase was almost designed to become metaphorical.
A person's “thunder” could easily become their striking idea, achievement, announcement or dramatic moment.
To steal it was to get there first, appropriate the credit or draw the audience’s attention away.
Today someone can steal your thunder without taking anything physical at all.
They can announce their engagement at your party, present your idea before you do, or reveal news you were preparing to share yourself.
The Story Everyone Tells
Dennis invents a thunder machine.
His play flops.
Macbeth replaces it.
Dennis sits in the audience, hears his own thunder rolling across the stage and explodes with indignation:
They will not have my play, yet they steal my thunder.
It is almost suspiciously perfect as an idiom-origin story.
In this case, however, the essentials appear to be true.
What the Evidence Actually Says
WELL SUPPORTED
The core episode is supported by multiple historical retellings.
What should not be treated as certain is the exact quotation.
Different accounts give Dennis slightly different words, and the surviving versions were written down after the performance rather than transcribed at the moment he shouted them.
Quote Investigator traces early retellings in which Dennis complains that actors had reused his thunder effect, while later eighteenth-century versions contain wording recognisably close to the phrase we now use.
So the event is much firmer than the quotation.
John Dennis almost certainly gave us the story behind “stealing thunder”.
Exactly what he yelled from the pit is harder to recover.
Why It Stuck
Thunder is naturally theatrical.
It arrives loudly, attracts attention and overwhelms everything around it.
That makes it an unusually good metaphor for somebody’s big moment.
And unlike many supposed phrase origins, this one comes with something even better than a neat explanation:
a playwright who appears to have experienced the metaphor before the rest of us had even started using it.
Related Curiosities
Why Do Actors Say “Break a Leg”?
Why Do We Say “Spill the Beans”?
Why Do We Say “Bite the Bullet”?
Sources & Further Reading
Quote Investigator — “They Will Not Let My Play Run, But Steal My Thunder.” Reviews historical versions of the John Dennis story and the changing wording of the quotation.
Encyclopaedia Britannica, Ninth Edition — John Dennis. Records the 1709 Appius and Virginia production, the theatrical thunder effect and its reuse in Macbeth.
Gary Martin, Phrase Finder — “Steal One’s Thunder.” Discusses Dennis, Drury Lane and the later development of the expression.
John Dennis — Appius and Virginia, 1709.
Last checked: 22 September 2026