Tag up

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In baseball, to tag up is to retouch or remain on the runner's time-of-pitch base until (after) the ball is first touched by a fielder. A runner must, by rule, tag up only when a batted ball is caught in flight. After a legal tag up, even if the ball was caught in foul 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. On short fly balls, runners seldom attempt to advance after tagging up.

After a caught fly ball, if a fielder can touch the runner or his time-of-pitch base before he tags up, the runner is out. This is considered an appeal play. This often occurs on infield line drives.ja:タッチアップ