This is the 590th most frequent German word.
fallen
"Fallen" - to fall.
Here, 'fallen' is used in its literal sense as to physically drop downward due to gravity.
Die Blätter fallen im Herbst von den Bäumen.
The leaves fall from the trees in autumn.
In this context, 'fallen' is used metaphorically to describe a decrease in value or level, here concerning the price.
Der Preis ist letzte Woche gefallen.
The price dropped last week.
'Fallen' here is utilized metaphorically to describe a sudden negative emotional reaction, often associated with disappointment or despair.