This is the 10077th most frequent French word.
grisonne
"Grisonne" means "grayish" or "turning gray."
The word "grisonne" is used here to describe the act of a sky becoming gray, implicating a change in weather.
Le ciel grisonne alors que la pluie commence à tomber.
The sky turns gray as the rain starts to fall.
"Grisonner" in this sentence describes the process of aging in the dog's coat, yielding a grayish appearance.
Son chien, qui d'habitude a un pelage noir éclatant, commence à grisonner avec l'âge.
His dog, which usually has a shiny black coat, begins to gray with age.
The verb "grisonner" is used to indicate the gradual graying of hair over time.