To “steal someone’s thunder” is to pre-empt someone and take attention, praise, or advantage away from them. Phrase Finder connects the expression with playwright John Dennis and a theatrical thunder effect in the early eighteenth century, but the famous wording survives through later reports, so the engine separates the reported event from the later printed documentary chain.
ReviewedEvidence2 sourcesSectionPhrases & Idioms
Quick answer
It means to do or announce something before someone else in a way that takes away their impact, success, or praise.
Key details
Core Meaningpre-empt someone and take their impact or praise
Documentary Cautionfamous wording is later-reported
Historical Contextearly eighteenth-century London theatre
What the evidence supports
Plausible context, not proved
The idiom is associated with John Dennis’s theatrical-thunder episode.
A specialist historical account ties the phrase to Dennis, while also noting uncertainty about the exact original wording.
Documented timeline
1704
John Dennis theatrical episode
Phrase Finder places Dennis’s Appius and Virginia production and thunder device in 1704.
secondary reportedconfidence: medium
1893
Later printed report preserves the famous wording
Phrase Finder cites W. S. Walsh’s Literary Curiosities (1893), quoting Joseph Spence’s record of Dennis’s reaction.
secondary reportedconfidence: medium-high
Variants
steal someone's thunder
Current Cambridge form.
steal one's thunder
Common generic variant used by Phrase Finder.
Meaning over time
Theatrical thunder effect
The historical story concerns a stage method for producing thunder.
Pre-empt and take credit/impact
The modern idiom refers to taking away another person’s impact, success, or praise by acting first.
Further guidance
Documentary Boundary
The often-quoted outburst is preserved through later reporting. The engine therefore does not treat the exact wording as a directly inspected 1704 quotation.
Meaning
Cambridge defines the idiom as doing what someone else intended to do first, especially when this takes success or praise away from them.
Theatrical Context
Phrase Finder connects the expression to John Dennis’s stage-thunder innovation around his production of Appius and Virginia.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
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