This is the 16512th most frequent Korean word.
사고까지
"사고까지" means "up to the accident" or "even the accident," depending on context.
Here, "사고" refers to an 'accident', and "까지" denotes the scope extending to analyzing the accident.
그는 일찍 일어나서 공부를 시작했고 사고까지 치열하게 분석했다.
He woke up early, started studying, and meticulously analyzed the accident.
In this sentence, "사고까지" indicates including accidents in the explanation of the user's discoveries.
발견한 사고까지 표현해가며 자신의 이론을 설명했다.
He explained his theory while expressing the discoveries, including the accidents observed.
This usage of "사고" refers to 'thinking' or 'thoughts', and "까지" amplifies the extent of the influence to encompass even his thinking.