This is the 487th most frequent Serbian word.
пада
"Пада" in English means "falls" or "is falling."
Here, 'пада' is used to describe the action of falling, specifically referring to snow descending from the sky.
Када пада снег, све изгледа лепше.
When snow falls, everything looks prettier.
In this context, 'пада' means that her voice is diminishing or lowering in tone or volume when speaking.
Њен глас пада док говори.
Her voice falls as she speaks.
The word 'пада' here is used to describe the wall collapsing or losing its stability.