from πρός and κόπτω; to strike at, i.e. surge against (as water); specially, to stub on, i.e. trip up (literally or figuratively):--beat upon, dash, stumble (at).
("scandal"); probably from a derivative of κάμπτω; a trap-stick (bent sapling), i.e. snare (figuratively, cause of displeasure or sin):--occasion to fall (of stumbling), offence, thing that offends, stumblingblock.