fall over

verb5

1. •
   To fall from an upright or standing position to a horizontal or prone position.
2. •
   (informal) Of a computer program or system, to crash.
3. •
   (South-Africa, informal) To break down; to become inoperable.

   • We'll have to walk; my car has fallen over.
4. •
   Of an argument, to fail to be valid.
5. •
   (no longer used) To revolt or change allegiance.