“Steal someone’s thunder” means to take attention or credit from someone, often by announcing an idea or piece of news before they can. The phrase is usually linked to playwright John Dennis and a theatrical mishap in London in 1709. Dennis had devised a way to imitate thunder for his play *Appius and Virginia*, which failed to attract an audience. According to the familiar story, he later heard the same effect in a production of *Macbeth* at the same theater.
Dennis is said to have protested that the theater had rejected his play but taken his thunder. The anecdote gives the expression a vivid origin, but it is not a transcript we can confidently treat as a verbatim record: accounts differ in how they quote his reaction, and the story is better regarded as the phrase’s traditional explanation than as proof of a precisely documented coinage. The episode is commonly dated to 1709, around the time the phrase entered circulation; the precise first use is less certain than the story suggests.
The theatrical setting helps explain the original force of the image. Thunder was a dramatic effect, and Dennis’s grievance was that someone else had used a device he believed was his. Over time, the expression broadened beyond literal imitation or disputed invention. Today, a person can “steal someone’s thunder” simply by preempting an announcement, taking credit, or doing something that draws attention away from another person’s moment. The phrase describes the loss of impact as much as the taking of an idea.
For example: “Maya was about to reveal the new project, but her manager stole her thunder by announcing it first.” Or: “I don’t want to steal your thunder, so you should tell the team about your award.” In both cases, the issue is who gets to command the moment—not whether anyone has literally borrowed a sound effect.
The phrase endures because its image is instantly clear: when someone else makes the noise, your own big moment can disappear.