This is the 9226th most frequent Korean word.
걷는
"Walking" (present participle form).
Here, '걷는' is used as an adjective modifying '것', forming '걷는 것', which means 'the act of walking'.
그는 매일 아침 공원에서 걷는 것을 즐깁니다.
He enjoys walking in the park every morning.
In this sentence, '걷는' acts as an adjective to describe '길', specifying 'the path walked on'.
걷는 길이 오래되어 보입니다.
The path walked on looks old.
Here, '걷는' is part of the phrase '걷는 동안', indicating the time during which the action 'walking' occurs.