This is the 4265th most frequent Polish word.
drżą
"Drżą" means "they tremble" or "they shiver" in English.
Here 'drżą' signifies the physical trembling or shaking of the leaves caused by the wind.
Liście drżą na wietrze.
Leaves are trembling in the wind.
In this context, 'drżą' is used metaphorically to describe the way people may physically shake due to emotional fear or stress.
Ludzie drżą ze strachu podczas burzy.
People are trembling with fear during the storm.
'Drżą' here expresses the involuntary physical trembling of hands due to nervousness or anxiety.