退学

1. Origins, structure, and basic meaning

• Structure: The spelling is 退学, read たいがく, and it combines 退, meaning withdraw, with 学, meaning school or study.
• Basic usage: The basic sense of 退学 covers both a student withdrawing from school and losing student status through expulsion.

2. Common pitfalls and similar expressions

• Withdrawal and expulsion
  • The forms are 退学した and 退学処分. Context and the surrounding expression distinguish voluntarily leaving school from being expelled for a serious violation.
• Career change and rule violation
  • 彼は進路を変えるため大学を退学した。 — He left university to change his career path.
  • 重大な規則違反で退学処分を受けた。 — The student was expelled for a serious rule violation.