"Pinch-hit for" is a common baseball term that refers to a substitute batter who replaces another batter at a crucial moment. However, in everyday life, we often use this term metaphorically to describe someone who fills in or substitutes for someone else in a challenging situation. Synonyms for this term include fill-in, stand-in, substitute, alternate, proxy, and replacement. These words all suggest the idea of taking the place of another in a temporary or emergency situation. By using synonyms for "pinch-hit for," we can convey a sense of readiness and flexibility in adapting to unexpected circumstances.