續一切經音義 4.112

4.112

谷響（上古屋反切韻山谷也老子云谷神不死是為玄牝下虗兩反考聲云崖谷應聲也或作[鄉/占]𧬰嚮三形亦通也）。

Valley echo (guxiang 谷響: the first character has the fanqie [reading] gu + wu [gu]. The Qieyun says: "A mountain valley." Laozi says: "The valley spirit never dies; it is called the Mysterious Female." The second character has the fanqie [reading] xu + liang [xiang]. The Kaosheng says: "The echo responding in cliffs and valleys." It is also written in the three forms [鄉/占], 𧬰, and 嚮, which are all interchangeable).