ἀνάδοχος
From LSJ
ἰσότης φιλότητα ἀπεργάζεται → equality leads to friendship
English (LSJ)
ον,
A taking upon oneself, giving security for, πρὸς τὴν ἀδελφὴν ἀ. τῶν χρημάτων Men.516. II as Subst., security, surety, D.H.6.84, Plu.Dio18; τῆς φιλίας Κύπρις ἀ. PGrenf.1.1; περί, ὑπέρ τινος, Phalar.Ep.22,38.