This is the 12368th most frequent Polish word.
mrozi
"Freezes" or "chills."
In this sentence, 'mrozi' is used as a verb meaning 'freezes', indicating the act of turning water into ice due to cold temperatures.
Mróz mrozi wodę na stawie.
The frost freezes the water on the pond.
Here, 'mrozi' refers metaphorically to the car becoming extremely cold or frozen during icy conditions.
Samochód mrozi w zimowej nocy.
The car freezes on the winter night.
In this context, 'mrozi' is used figuratively to express being overwhelmed or immobilized by fear, akin to being frozen.