잠자다
jamjada · TOPIK 1
to sleep
🛏️ 잠자다 = 잠 (sleep, noun) + 자다 (to sleep): to sleep a sleep
자다 alone already means to sleep. 잠 is its noun form, built by adding the noun ending ㅁ to the stem 자. So 잠자다 literally doubles up: to sleep a sleep, like English dream a dream.