noun
pinch-hitting; pinch hitter
Baseball term for a substitute batter. Also used metaphorically for a substitute in other contexts.
九回裏、代打にベテラン選手が送られた。
In the bottom of the ninth, a veteran player was sent in as a pinch hitter.
彼は代打でホームランを打った。
He hit a home run as a pinch hitter.
noun
Extended use: someone who performs a duty or role in place of another person, often in business or formal settings.
社長が急病のため、副社長が代打で会議に出席した。
Because the president suddenly fell ill, the vice president attended the meeting as a substitute.
彼は急な代打でプレゼンを任された。
He was entrusted with the presentation as a last-minute stand-in.
Compound of 代 (substitute) and 打 (hit, strike). Originally a baseball term, later extended to general substitution.