This is the 9245th most frequent Korean word.
걸어온
"걸어온" means "walked" or "has walked."
걸어온 is used here as a modifier for '길', referring to the 'path' that someone has walked.
그가 걸어온 길은 정말 힘들었다.
The path he has walked was really tough.
걸어온 modifies '여정', meaning the 'journey' traveled or walked in a metaphorical sense.
우리는 우리의 삶에서 걸어온 여정을 되돌아보았다.
We reflected on the journey we have walked in our lives.
걸어온 modifies '인생', referring metaphorically to the life path traversed or lived.