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동작이

movement

→ 동작
phrase Rare #26,498
movement 동작 means “movement,” “motion,” or “action,” especially a physical movement. 이 is the subject particle, marking 동작 as the subject.
KO: 그의 동작이 아주 자연스러워요.
EN: His movements are very natural.

그 사람은 동작이 빨라요.

That person is quick on his feet.

이런 동작이 원래 있어요

This behavior is there by default.

— 스파이더맨: 뉴 유니버스 (2018)