If someone falls over, they fall to the ground:
She tripped and fell over.
If something falls over, it falls onto its side:
If you make the cake too high, it'll fall over.
(Cambridge Advanced Learner's Dictionary & Thesaurus からの fall over の定義 © Cambridge University Press)
if a computer or a computer program falls over, it suddenly stops working:
If the program falls over on complicated drawings, it is of no use to us professionally.
if a business falls over, it goes bankrupt:
Hotels and catering companies have been falling over at an increasing rate lately.
(Cambridge ビジネス英語辞典 からの fall over の定義 © Cambridge University Press)
- Cambridge Dictionary