續一切經音義 2.14

2.14

洄澓（上戶恢反爾雅曰逆流而上曰泝洄下符福反三蒼云澓深也謂河海中洄旋之處也說文竝從水回復皆聲也）。

Whirlpool / backwater (洄澓) (The first [character] has the fanqie hù + huī [huí]. The Erya states: 'Going upstream against the current is called sùhuí.' The second [character] has the fanqie fú + fú [fù]. The Sancang states: 'Fù means deep, referring to a place of whirling currents in rivers or seas.' In the Shuowen both derive from water (水), with huí (回) and fù (復) both acting as phonetics).