καταισχύνεσθαι
From LSJ
χελῶναι μακάριαι τοῦ δέρματος → you tortoises are fortunate in your skin, you blessed turtles with your shell
Greek > English (Woodhouse Verbs Reversed)
(see also: καταισχύνω) be ashamed before, feel shame before
Lexicon Thucydideum
erubescere, to grow red, blush, 6.13.1.