續一切經音義 9.142

9.142

吁嗟（上況于反考聲吁疑恠之詞也從口于聲律文作噓音朽居反吹噓也非吁嗟字下子邪反切韻云咨嗟發歎詞也）。

吁嗟 (The first character has the fanqie 況于 [xū]. The Kaosheng states: '吁 is an exclamation of doubt or surprise; derived from 口 with 于 as phonetic.' In the Vinaya text it is written as 噓 with the sound 朽居 [xū], meaning to blow or exhale, which is not the character for 吁嗟. The second character has the fanqie 子邪 [jiē]. The Qieyun states: 'An exclamation of sighing or lamentation.').