Diéyīn (-)
original: 叠音
Acciaccatura, applied to separate two notes, as an embellishment or in order to suggest a staccato
Literal translation: 叠: "(to) pile up / repeat"; 音: "sound / tone"; Defined by Wong as "acciaccatura", which is a kind of gracenote.
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.157 & 826.