Strong's G4350 — προσκόπτω (verb)
proskopto (pros-kop'-to) v.
1. to strike at, i.e. surge against (as water)
2. (specially) to stub on, i.e. trip up
{(specially) "stumble" literally or figuratively}
[from G4314 and G2875]
KJV: beat upon, dash, stumble (at) 
Root(s): G4314, G2875 
Hebrew root: κόπτω
Occurrences: 8