I am bored. I just made a random disovery. heh
먹구름 (dark clouds). I wondered how did the word came about because i was expecting something like black/dark + clouds. Now i finally know how the 먹 comes about.
먹: ink (eg. 먹물 -> chinese ink 墨）
And i finally realised how good it is to know chinese when studying korean. 한자 다 할 줄 알아요. ㅋㅋ