noun
Baseball term for a substitute batter brought in during a critical moment.
九回裏、監督は危機打者を送った。
In the bottom of the ninth, the manager sent in a pinch hitter.
代打 is the general term for a pinch hitter, while 危機打者 specifically emphasizes a batter brought in during a critical or clutch situation.
Compound of 危機 (crisis) and 打者 (batter), literally 'crisis batter'.