didn't invent gunpowder
Didn't do anything significant. I don't understand why he's so conceited—he didn't invent gunpowder or anything!
didn't invent gunpowder
Rur. did not do anything terribly important. He may be the class president, but he didn't invent gunpowder. What's all this fuss about a movie star? She didn't invent gunpowder!