Brawn means muscular strength. Brawn is thought of as the opposite of brains, but let’s face it — people can be strong and smart! No matter how smart you are, though, you must have big muscles to have brawn.
The word brawn is from the Old French word braon, which means “fleshy or muscular part,” referring to a part of an animal that people cook and eat. British English still uses brawn to mean meat, headcheese in particular. In American English, brawn refers to strength and heft. You may also have heard the adjective brawny, meaning strong and muscular.