This is the 6823rd most frequent Korean word.
인사하는
"인사하는" means "greeting."
Here, "인사하는" functions as a participle that modifies "습관" to describe the habit of greeting.
그녀는 학교 가는 길에 항상 이웃들에게 인사하는 습관이 있다.
She has the habit of greeting the neighbors every day on the way to school.
In this sentence, "인사하는" serves as an adjective to describe "people" who are engaged in the act of greeting.
인사하는 사람들 사이에서 그는 눈에 띄는 외모를 가지고 있었다.
Among the people greeting each other, he stood out with his appearance.
Here, "인사하는" is part of a grammar structure indicating the act of greeting, used to construct the main clause.