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많이 해

do a lot

→ 많이
phrase Common #1,912
do a lot 많이 means “a lot,” and 해 is the informal form of 하다, “to do.” The phrase can refer to doing an activity or, with 걱정, worrying a lot.
KO: 운동 많이 해.
EN: Exercise a lot.

아휴, 그래 잠수 많이 해, 자인아, 잠수

Oh, fine—go ahead and disappear on me, Jain. Just keep ghosting me.

— The Great Flood (2025)

어린 시절 생각도 많이 해

I often think about my childhood, too.

— 페인 앤 글로리 (2019)