This is the 1422nd most frequent Korean word.
이르기까지
"이르기까지" means "up to/until reaching."
The word '이르기까지' here is used to indicate reaching or achieving a certain point after a progressive effort.
그는 어렸을 때부터 노력해 온 덕분에 오늘날의 성공에 이르기까지 모든 것을 이뤘습니다.
Because he has been striving since his childhood, he has achieved everything up to his current success.
In this sentence, '이르기까지' is applied to signify a span or extent of process, denoting progression over steps.
그 프로젝트에는 기획 단계에서 이르기까지 신중함이 요구되었습니다.
The project required careful consideration from the planning stage up to its execution.
Here, '이르기까지' is used to convey concluding a challenging journey or event into a noteworthy accomplishment.