Tag out

A 1911 American Tobacco Company baseball card illustrating a baserunner being tagged out at third base.
Wikipedia - "In baseball, a tag out, sometimes just called a tag, is a play in which a baserunner is out because a fielder touches him with the ball or with the hand or glove holding the ball, while the ball is live and while the runner is not touching a base. A runner must sometimes advance to the next base because a batter, advancing to first, forces that runner to advance ahead of him to the next base. Two runners are not allowed on one base at one time, so a batter can, in effect, bumper-car a runner forward. Such a runner is spoken of as having been forced to the next base. A defensive play against that runner is called a force play and, if successful, a force out. A tag can put runners out on a forced play as well (in lieu of stepping on a force base). ..."
Wikipedia