ἐπισχύω
From LSJ
Μούνη γὰρ ἄγειν οὐκέτι σωκῶ λύπης ἀντίρροπον ἄχθος → I have no longer strength to bear alone the burden of grief that weighs me down
English (LSJ)
(ἰσχύς)
A make strong or powerful, τὴν πόλιν X.Oec.11.13. II intr., to be or grow strong, Thphr.CP2.1.4; prevail, D.S. 5.59, Corn.ND7 ; to be urgent, ἐπίσχυον λέγοντες Ev.Luc.23.5 ; ὁ λόγος -ύσει πρὸς συμβουλίαν ἢ διδαχήν Vett.Val.48.6.