This is the 10306th most frequent Polish word.
chmurzyć
"Chmurzyć" means "to cloud over" or "to become overcast."
Here, 'chmurzyć się' metaphorically describes facial expression becoming dark or gloomy, reflecting negative emotions.
Jego twarz się chmurzyła po usłyszeniu złych wiadomości.
His face darkened upon hearing the bad news.
In this example, 'chmurzyć się' directly describes the gradual process of the sky filling with clouds, signalling upcoming rain.
Niebo stopniowo chmurzyło się, zwiastując deszcz.
The sky gradually became cloudy, indicating rain.
In this sentence, 'chmurzyć się' refers to the weather becoming cloudy, typically involving clouds gathering in the sky.