πρόσκρουμα

A. that against which one strikes, obstacle, Arist. PA 658a7 (pl.).

2. knock, Hippiatr. 96.

II. stumblingblock, cause of offence or friction, D. 54.3 (pl.), J. BJ 1.26.3 (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.