答辩
dá biàn · HSK 7
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🎓🛡️ dá biàn sounds like DA-bate: you debate to defend your thesis
答 (answer) + 辩 (argue/debate). A dissertation defense is literally an answer-debate — you reply to the committee's challenges and argue your case.
答 — bamboo radical 竹 + 合 (combine)
Originally written with the bamboo radical because answers were inscribed on bamboo slips. The phonetic 合 ('to join, match') gives both the sound and the sense of a reply 'matching' a question. Over time 答 came to mean 'answer' or 'respond' generally.
辩 — two 辛 (xīn) flanking 讠(speech)
辩 is a phono-semantic compound. The center 讠(speech) gives the meaning—using words—while the two 辛 elements on either side originally depicted disputants or legal parties facing off. Together the form pictures two sides arguing through speech, hence 'to debate, dispute, argue.'