Nantoka/오수osu오수 (osu) is a Korean word meaning “afternoon nap”.Meanings1afternoon napPart of speechnounHanja午睡Related words오후afternoon오전morning정오noon수면sleep수면제sleeping pill단오Dano하오afternoon오밤중midnight오찬luncheon오후반afternoon class오전반morning class혼수deep sleepStudy Korean with flashcards →