一切經音義 6.75

6.75

推究（上出佳反考聲窮詰也說文推究也從手隹聲亦假偕字也下鳩宥反毛詩傳云究深也說文窮也從穴九聲或作𠃙𡧫𠬚[究/敢]竝是古字）。

Investigate and examine (推究: the first is pronounced with the fanqie 出佳 [chuī]. The Kaosheng says: "To probe and interrogate." The Shuowen says: "To investigate thoroughly; deriving from 'hand' [手] with 隹 as phonetic; it also borrows the character 偕." The second is pronounced with the fanqie 鳩宥 [jiù]. The Mao Commentary on the Classic of Poetry says: "Jiu means deep." The Shuowen says: "Exhaustive; deriving from 'cave' [穴] with 九 as phonetic." It is also written as 𠃙, 𡧫, 𠬚, or [究/敢], all of which are ancient forms).