Chuī kǒu (-)
original: 吹口
blowhole of the mouthpiece of the cup of a mouth organ with a circular (cup-/bowl-shaped) wind chest
Literal translation: 吹: "(to) blow/puff", "(to) play (a wind instrument)"; 口: "mouth", "opening", "hole"; blowhole in the mouthpiece of the Yuán shēng.
汉英词典 (Hàn Yīng cídiǎn) / A Chinese-English dictionary. 北京 [Běijīng], 1985, p.108 & 393 (口 ➀, ➁, ➃).