This is the 9740th most frequent Polish word.
zawaliła
"Zawaliła" means "she/it collapsed" or "she/it failed."
In this context, 'zawaliła' describes failing or not succeeding in an important task.
Ona zawaliła ważny egzamin.
She failed an important exam.
Here, 'zawaliła' describes the physical collapse or falling apart of a structure.
Wczoraj zawaliła się stara kamienica w centrum miasta.
Yesterday, an old tenement building in the city center collapsed.
In this instance, 'zawalił się' (a reflexive form) illustrates the disruption or failure of an arrangement or plan.