ὑποκρίνεσθαι
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 ὑποκρίνομαι): play, represent, act a part, act in a play, play apart, play role of, represent by acting