LSJ
make secure, Cic. Att. 6.4.3, Archig. ap. Aët. 6.50, Gal. 14.298; more freq. in Med., τὰ καθ’ αὑτόν Phld. Rh. 2.141 S. ; τὸν τόπον Str. 17.1.54; τὰ κύκλου σάνισιν Ath.Mitt. 32.259 (Pergam.); secure the allegiance of persons, ὅρκοις τινάς J. BJ 2.8.7.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)