When you use a broom to clean the floor, you sweep. You also sweep when you move in a smooth, confident way, like when you sweep onto the dance floor in a dazzling new outfit.
A barber sweeps up hair from the the barber shop floor, and your melodramatic brother sweeps his homework off his desk with his arm when he's frustrated. You can also use sweepfor things that move fast, like a car sweeping down a driveway or fire that sweeps through a forest. Informally, sweep also means "to win every contest," like when your favorite team sweeps the World Series. This usage comes from an older meaning, "winning all hands in a card game."