The Chinese word 口蜜腹剑 is formed by combining the characters 口 (mouth), 蜜 (honey), 腹 (belly), and 剑 (sword) into a four-character compound. It structures 口蜜 to denote honeyed words from the mouth and 腹剑 to signify a sword concealed in the belly, directly linking sweet speech with hidden peril to create a phrase that describes deceptive kindness.