Some idioms have surprisingly literal beginnings, and “to steal someone’s thunder” is one of them. Today, it means overshadowing someone by taking attention, credit, or impact that should have been theirs.
In use
I was about to announce my promotion, but my cousin stole my thunder by sharing her engagement news first.
The small startup stole the tech giant’s thunder by releasing a similar product just hours before the big company’s launch event.
The origin of the idiom traces back to early 18th-century theatre. English playwright John Dennis reportedly devised an innovative theatrical method for creating thunder sound effects for his play Appius and Virginia. He used a “thunder run” (a trough with metal balls) or perhaps a large tin sheet.
While the play was a flop and closed quickly, Dennis later attended a production of Shakespeare’s Macbeth and was outraged to hear the same thunder-making technique being used without his permission. He reportedly cried out: “See how the rascals use me! They will not let my play run, and yet they steal my thunder!”
The expression survived long after the theatrical dispute faded. Today, it is commonly used in workplaces, families, and public life, whenever someone unintentionally or deliberately upstages another person. Tracing its origins reminds us that while ideas can be borrowed, the credit for innovation should always stay where it was earned.
