개학이 · 개학을
start of the school term, school opening
Example
다음 주 월요일에 개학이라서 숙제를 빨리 끝내야 해요.
School starts next Monday, so I have to finish my homework quickly.
Word parts
개 open+학 study, school
Literally 'opening school' after a vacation.
Good to know
Opposite of 방학 (vacation); 개학하다 means the term starts again after a break.
Related words