LSJ
add strength to, strengthen or encourage in a thing, αὗται [αἱ νέες] . . σφέας ἐπέρρωσαν Hdt. 8.14; τοὺς μὲν ἐξέπληξε, τοὺς δὲ πολλῷ μᾶλλον ἐπέρρωσεν Th. 4.36, cf. 8.89; εἰς τὸ ἐπιρρῶσαι αὐτούς X. HG 7.5.6; ἐ. τινὰ πρὸς τὸν πόλεμον Plu. Lys. 4; ἐπίρρωσον σαυτήν collect your strength, Luc. Tim. 41; ἐ. τὴν γνώμην, τὰ πάθη, Plu. Adul. 2.62a, QConv. 681f.
2
stream, rush down, ἁθρόοι καταρρέοντες Ar. Ach. 26; οἱ δὲ ἐμπαλασσόμενοι κατέρρεον, i. e. into the river, Th. 7.84; μὴ σφαλεὶς καταρρυῇς Ar. Pax 146, cf. 71; sink down, κ. ἀπὸ τῆς κλίνης ἐπὶ τοὺς πόδας Hp. Prog. 3; εἰς τοὺς ὁμαλοὺς τόπους Plb. 8.14.6; διὰ τοῦ τέγους κ. Luc. Tim. 41: c. acc., τὴν ἀτραπὸν κατερρύην Ar. Fr. 47.
bringing gain, epith. of Apollo, Lyc. 208, IG 9(2).512.20 ( Larissa), 1234 ( Phalanna); of Hermes, Plu. Tranq. 2.472b, Luc. Tim. 41, etc.
III
call up or forth, εὐγένειαν E. HF 308; τὸν Θησαυρὸν ἐς τουμφανές Luc. Tim. 41; τρίχας Dsc. 2.151.
monstrous, prodigious, ὡς τ. τι πεποιηκώς (Bernard. rightly ὥσπερ ἀστεῖόν τι) Thphr. Char. 19.9; τ. τι πάσχεις Luc. DMort. 7[17].1; τ. τὸ πρᾶγμα ἐφαίνετο Id. Alex. 16; τ. σημεῖον Ezek. Exag. 91, cf. Sm. Nu. 13.34(33), al.; τ. ἔργον Ph. 1.544; τεράστιοι perh. = τερατουργοί in Rhetor. in Cat.Cod.Astr. 8(4).148: Ζεὺς τ. the god of portents, Luc. Tim. 41, Aristid. 2.65 J., IG 5(1).1154 ( Gythium); δαίμονες τ. Hld. 2.5: τὸ τ., = τέρας, J. AJ 10.2.1; a monstrous birth, Paul.Aeg. 3.76 (pl.). Adv. -ίως Eust.ad D.P. Proll. p.79 B.
exceedingly sweet, used in Sup. by Luc. Tim. 41, etc. Adv. -έως very gladly or pleasantly, X. Cyr. 1.6.21, Phld. Lib. p.43 O.: Sup. -ήδιστα Luc. DMort. 19[9].1.