βεβαιόω
βεβαιόω
from βέβαιος
to make firm, confirm, establish, secure, warrant, make good, Plat., Xen.; ἔργωι βεβαιούμενα things warranted by fact, opp. to ἀκοῆι λεγόμενα, Thuc.
β. τί τινι to secure one the possession of a thing, Thuc.:—Mid. to establish for oneself, to confirm, secure, Thuc.
Mid. also to secure oneʼs ground in argument, to asseverate, maintain, make good, Plat.
to guarantee a title, Isae.