This is the 2219th most frequent Korean word.
지키기
"지키기" means "keeping" or "protecting."
Here, '지키기' is used with '규칙' (rules), emphasizing the action of keeping or adhering to rules.
규칙을 지키기 위해 노력해야 한다.
One must strive to uphold the rules.
In this sentence, '지키기' is about the act of preserving nature, indicating responsibility.
자연을 지키기는 우리의 책임이다.
Protecting nature is our responsibility.
'지키기' here conveys the decision to uphold or honor a promise.