1. to fall down; to drop; to fall (e.g. rain); to sink (e.g. sun or moon); to fall onto (e.g. light or one's gaze); to be used in a certain place (e.g. money)
occ. 堕ちる for depravity and 墜ちる for a crash
4. to fail (e.g. exam or class); to lose (contest, election, etc.)
5. to crash; to degenerate; to degrade; to fall behind