to stumble

a form of πίπτω; to trip, i.e. (figuratively) to err, sin, fail (of salvation):--fall, offend, stumble.

a primitive root; to totter or waver (through weakness of the legs, especially the ankle); by implication, to falter, stumble, faint or fall; bereave (from the margin), cast down, be decayed, (cause to) fail, (cause, make to) fall (down, -ing), feeble, be (the) ruin(-ed, of), (be) overthrown, (cause to) stumble, [idiom] utterly, be weak.