Inherited from Proto-Tai *sajꟲ. Cognate with Thai ไส้ (sâi), Lao ໄສ້ (sai), Northern Thai ᩈᩱ᩶, Lü ᦺᦉᧉ (ṡay²), Shan သႆႈ (sāi), Aiton ꩬ︀ႝ (say), Phake ꩬ︀ႝ (say), Ahom 𑜏𑜩 (say), Tai Dam ꪼꪎ꫁.
saej