一切經音義 59.5

59.5

稽首（字詁古文[(二/日)*(首-目+日)]同苦禮反白虎通曰所以稽首何稽至也首頭也言頭至地也三蒼稽首頓首也說文下首也周禮太祝辯九拜一曰[(二/日)*(首-目+日)]首是也）。

稽首 (The Zhigu gives the ancient script as [(二/日)*(首-目+日)], same; *kǔ-lǐ fan. The Baihutong says: "Why does one bow with稽首? 稽 means to reach; 首 means the head; it means touching one's head to the ground." The Sancang says: "稽首 means knocking the head [to the ground]." The Shuowen says: "Bowing down the head." The Rites of Zhou states that the Grand Invoker distinguishes nine types of bows, the first of which is the head-to-ground bow [(二/日)*(首-目+日)]首; this is it).