This is the 2358th most frequent Korean word.
고등학교
"High school."
Used to indicate the place where studying occurred, specifying high school as the location.
저는 고등학교에서 영어를 공부했어요.
I studied English in high school.
Used to refer to the time period of one's life during high school.
고등학교 시절은 정말 즐거웠어요.
High school days were really enjoyable.
Used to specify the school level the younger sibling is attending.