συνήδεσθαι
From LSJ
ἀσκὸς ὕστερον δεδάρθαι κἀπιτετρίφθαι γένος → I'd be willing to be flayed into a wineskin afterwards and to have my line wiped out
Greek > English (Woodhouse Verbs Reversed)
(see also συνήδομαι): in joy, rejoice with another, sympathise with in joy, sympathise with