ῥικνόομαι
From LSJ
Ἔοικα γοῦν τούτου γε σμικρῷ τινι αὐτῷ τούτῳ σοφώτερος εἶναι, ὅτι ἃ μὴ οἶδα οὐδὲ οἴομαι εἰδέναι → I seem, then, in just this little thing to be wiser than this man at any rate, that what I do not know I do not think I know either
English (LSJ)
Pass.,
A grow stiff or be shrivelled by frost, heat, or old age, Arist.HA553a13, Opp.H.5.593, Sor.1.15. II dance with unseemly contortions, S.Fr.316, cf. Luc.Lex.8. III later Act., have sexual intercourse, πρὸς ἄνδρα, πρὸς γυναῖκα, PMag.Leid.W.6.28.