Definition of "understudying" [understudying]

• Present participle of understudy. (verb)

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• "MR: Now, you both were child prodigies as performers--Susan, you were understudying on Broadway at age six, and Derek you were turning heads in the music industry at age nine."
• "You do know he was already getting cast understudying Broadway tours, right?"
• "After understudying Ethel Merman on Broadway and being part of Martha Graham's dance company, Betty got famous for doing comical specialty songs, starting with "South America, Take It Away" from her huge Broadway hit, "Call Me Mister" that opened 65 years ago."