vice president (of a club, organization, etc.)
生徒会の副会長に選ばれた。
I was elected vice president of the student council.
副会長として議会を取り仕切った。
As vice president, I managed the council meetings.
副会長を務めながら新会長候補の育成に注力した。
While serving as vice president, I focused on developing candidates for the next president.