Xiàhuáyīn (-)
original: 下滑音
lowering a finger gradually in order to "glide" from a tone to a lower one
Literal translation: 下: "down", "downward"; 滑: "slippery/smooth"; 音: "sound/tone"; Defined by Wong as "(Portamento) downward glide"; ➺ Huáyīn, Shànghuáyīn.
Wong, Samuel Shengmiao: Qi’ - An instrumental guide to the Chinese orchestra. Singapore, 2005, p.142.
汉英词典 (Hàn Yīng cídiǎn) / A Chinese-English dictionary. 北京 [Běijīng], 1985, p.742 [left (下 ➃)], 288 & 826.