The word "swat" generally means to hit or strike something with a quick, forceful motion, often to kill or repel an insect or similar small creature. It can also refer to the action of tackling or dealing with a problem or issue in a decisive manner.
The term "swat" comes from the 15th-century Middle English word "swatten," which means "to strike or hit." It is likely derived from the Old Norse word "svatta," meaning "to strike."