Thayer's Greek Lexicon

 1. to fall out of, to fall down from, to fall off
2. metaph.
  1) to fall from a thing, to lose it
  2) to perish, to fall
2b1. to fall from a place from which one cannot keep
2b2. fall from a position
2b3. to fall powerless, to fall to the ground, be without
effect
2b  1) of the divine promise of salvation