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In baseball
Baseball is a bat-and-ball sport played between two teams of nine players each. The aim is to score runs by hitting a thrown ball with a bat and touching a series of four bases arranged at the corners of a ninety-foot diamond...

, to tag up is to retouch or remain on the runner's time-of-pitch base until (after) the ball either lands in fair territory or is first touched by a fielder. A runner must, by rule, tag up only when a batted ball is caught by a fielder (without touching the ground). After a legal tag up, even if the ball was caught in foul
Foul ball
In baseball, a foul ball is a batted ball that:* Settles on foul territory between home and first base or between home and third base, or* Bounds past first or third base on or over foul territory, or...

 territory, runners are free to attempt to advance. On long fly ball outs, runners can often gain a base; when a runner scores by these means, this is called a sacrifice fly
Sacrifice fly
In baseball, a sacrifice fly is a batted ball that satisfies four criteria:* There are fewer than two outs when the ball is hit.* The ball is hit to the outfield....

. On short fly balls, runners seldom attempt to advance after tagging up.

After a caught fly ball, a fielder with the ball can appeal that the runner did not retouch his time-of-pitch base after the ball was touched by a fielder by touching the runner or the runner's time-of-pitch base before he retouches the base, thus tagging the runner out
Out (baseball)
In baseball, an out occurs when the defensive, or fielding, team effects any of a number of different events, and the umpire rules a batter or baserunner out. When a player is called out, he is said to be retired...

. If the umpire agrees that the runner did not retouch after the ball was touched by a fielder, the umpire will call the runner out, regardless of what the runner had done after the ball is in play. This is a timing play, not a force play. All runs which score before the appeal will count (except those scored by runners that are called out).