Short reliever is a baseball term that refers to a pitcher who is brought in mid-game to replace the starting pitcher with the goal of stopping the opposing team's offensive momentum. Other possible synonyms for short reliever include relief pitcher, setup man, middle reliever, and fireman. These terms all describe a pitcher who is not the team's starting pitcher and is brought in specifically to relieve a struggling or fatigued pitcher. The role of the short reliever is crucial in baseball and can make or break a team's chances of winning. Having a reliable short reliever in the bullpen is often a key factor in a team's success.