1.
substitute player; reserve player; benchwarmer
A player who is on the team roster but not in the starting lineup, waiting on the bench to replace a starting player if needed. Used across various sports.
Related Words
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レギュラー (regular, starter)
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ベンチ入り (making the bench)
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補欠 (substitute, alternate)
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交代選手 (replacement player)
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スタメン (starting lineup)