ἀμφιβαίνειν
From LSJ
βορβόρῳ δ' ὕδωρ λαμπρὸν μιαίνων οὔποθ' εὑρήσεις ποτόν → once limpid waters are stained with mud, you'll never find a drink
Greek > English (Woodhouse Verbs Reversed)
(see also ἀμφιβαίνω): be spread round, glide over, steal over