καθυπογράφω
From LSJ
περὶ οὐδὲν γὰρ οὕτως ὑπάρχει τῶν ἀνθρωπίνων ἔργων βεβαιότης ὡς περὶ τὰς ἐνεργείας τὰς κατ' ἀρετήν → since none of man's functions possess the quality of permanence so fully as the activities in conformity with virtue
English (LSJ)
A describe, Eust.974.13; append signature to a document or edict, Sammelb.5251.4 (ii B.C.), PFlor.36.22 (iv A.D.), Cod.Just.1.1.7.11, etc.