ἰσχυροποιέω
From LSJ
Ζῆν οὐκ ἄξιος, ὅτῳ μηδὲ εἷς ἐστι χρηστὸς φίλος → Life is not worth living if you do not have at least one friend.
English (LSJ)
A strengthen, τὴν δύναμιν D.S.17.65; τὰς ἐπικρατείας τινός Plb.28.20.7; τόπον J.AJ15.8.5; στόμαχον [Gal.]14.752; establish, τὰς διατριβὰς τῶν ῥητορικῶν Phld.Rh.1.192S.:—Med., Onos.21.2:—Pass., ἰσχυροποιεῖται τὰ μέσα Ascl.Tact.10.16; τῆς δυναστείας -ουμένης D.S.14.9, cf. Arr.Epict.2.18.7; of assertions, Vett.Val.333.7; to be valid, ἡ ἀναλογία οὐκ -εῖται S.E.M.1.201.