理解
りかい · rikai · JLPT N3 · noun
understanding
💡 理解 = reason 理 + untie 解: to untie the logic of something
理 means reason or principle (also in 理由, reason). 解 means to untie or solve (also in 解決, solution). Understanding something means working out how its logic fits together. Sound hook: ri-KAI, the moment it finally clicks.
理 — jade radical 玉/王 + village 里 (phonetic)
理 is a semantic-phonetic compound: the jade radical 王 (玉) on the left signals meaning, while 里 on the right gives the sound. It originally meant the natural veins or grain in a piece of jade, then extended to 'pattern,' 'order,' 'principle,' and finally the modern senses 'reason' and 'to manage.'
解 — horn 角 + knife 刀 + ox 牛
解 is an ideograph showing hands using a knife (刀) to separate the horn (角) from an ox (牛). The original meaning was to butcher or dismember an ox, which broadened to 'untie, separate, loosen,' and then extended figuratively to 'explain' or 'understand'—to take something apart mentally.