The old bridge has fallen apart.

The plan has fallen through.

She has fallen in line with the new company policies.

He has fallen on a grenade to save his comrades.

She has fallen back on her old habits.

The comedian's joke had fallen flat, and the audience didn't laugh.

She has fallen victim to a scam.

She has fallen prey to his manipulative tactics.

He has fallen on hard times.

He has fallen from grace and lost all his power and influence.