A.that against which one strikes, obstacle, Arist.PA658a7 (pl.).
2. knock, Hippiatr.96.
II. stumblingblock, cause of offence or friction, D.54.3 (pl.), J.BJ1.26.3 (pl.); “πολιτικὰ π. τοῖς δημάρχοις πρὸς τοὺς ὑπάτους συνέστη” D.H.10.31, cf. 4.25; τὰ περὶ τὴν σιτοδοσίαν π. Id.7.45.—The form πρόσκρουμα (which is preferred by Thom.Mag.p.317 R., citing Aristid.1.455 J.) freq. occurs in the same Mss. as πρόσκρουσμα, cf. Plu.2.137c with 141b, al.