κατεγγυᾶσθαι
From LSJ
Ἔνιοι κακῶς φρονοῦσι πράττοντες καλῶς → Multi bonis in rebus haud sapiunt bene → Trotz ihres Wohlergehens denken manche schlecht
Greek > English (Woodhouse Verbs Reversed)
(see also κατεγγυάω): give security, give surety offer bail