"Tang Yun" annotates the pronunciation as wu kou qie. "Ji Yun" annotates the pronunciation as yu kou qie, with a similar sound to "ou." "Yu Pian" explains it as a type of pottery vessel. "Yangzi's Fang Yan" records that the utensil called fou is known as bou geng. "Shi Wen" clarifies that it is a basin.