This is the 16217th most frequent Polish word.
upaść
"Upaść" means "to fall" in English.
The word "upaść" is used to indicate something falling, typically due to gravity.
Chciałem złapać szklankę, ale upadła na podłogę.
I wanted to catch the glass, but it fell to the floor.
Here, "upaść" describes a person physically falling, losing balance.
Podczas biegu straciłem równowagę i upadłem.
During the run, I lost my balance and fell.
In this context, "upaść" is used metaphorically to indicate the collapse or failure of a company.