noun, noun or participle which takes 'suru', intransitive verb
leaving a club; quitting a club
Refers to formally withdrawing from a school club, team, or similar organized group. Often used with する to mean 'to leave/quit a club'.
See also: 入部 (にゅうぶ)
彼は先月、サッカー部を退部した。
He quit the soccer club last month.
退部
I submitted a club withdrawal form to the advisor.