潤う

うるおう · uruou · JLPT N1 · verb-godan

to be moist

💧 Water radical 氵 in 潤: moist soil gains, so 潤う means moist and also profit

潤 pairs the water radical 氵 with 閏, a sound-carrier. Moisture enriches soil and crops, which is why the word also means profiting.

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