standing erect or upright, as a collar.

performed, taken, etc., while one stands

a stand-up meal.

designed for or requiring a standing position

a stand-up lunch counter.

(of a fight) characterized by the rapid exchange of many blows with little attention given to defensive maneuvering.

characterized by an erect or bold stance

a stand-up batter who hits many doubles.

Baseball . (of a double or triple) pertaining to a hit that allows the hitter to reach the base safely without having to slide.

(of a comedian) delivering a comic monologue while alone on the stage.