steal one's thunder

What is the origin of the idiom "steal someone's thunder" and when to use it?

The idiom "steal someone's thunder" has its origins in the early 18th century and is attributed to John Dennis, an English playwright and critic. In 1709, Dennis invented a new method of simulating the sound of thunder for his play "Appius and Virginia" by rolling a sheet of tin to create a loud noise. However, his play was not successful, and it closed after just a few performances. Later, when another playwright, Richard Steele, used the same thunder-producing technique in his successful play, "Conscious Lovers," Dennis felt that his idea had been appropriated. He accused Steele of "stealing his thunder," coining the phrase. This phrase is used to describe a situation where someone takes credit for, or uses, another person's idea, work, or achievement, often to their disadvantage or without their permission. It implies that the original person's contribution has been overshadowed or diminished by the actions of another.