The kanji 解 primarily means "to understand," "to solve," "to untie," or "to release." It conveys the idea of breaking down something complex into simpler parts, finding a solution, or freeing something from a constraint. It suggests a process of coming to clarity or resolution.

・On-yomi (音読み): カイ (kai) ・Kun-yomi (訓読み): と（く） (to(ku)), ほど（く） (hodo(ku)), と（かす） (toka(su))

⚫︎ 問題を解く。 (Mondai o [kai]ku.) Translation: To solve a problem. ⚫︎ 理解 (りかい) (rikai) Translation: Understanding; comprehension ⚫︎ 解答 (かいとう) (kaitou) Translation: Answer; solution

The kanji 解 is a phono-semantic compound (形声文字, keisei moji). The left side is "角 (かく, kaku)" which originally depicted an animal horn, suggesting "something sharp". The right side is "牛 (うし, ushi)" meaning "cow." The original meaning might have related to cutting a cow’s horn. Later, it developed to indicate "to cut", "to take apart," and then extended to mean "to solve" or "to understand" in a broader sense.