Where does “grou” come from?

grou (Afrikaans) comes from Dutch grauw, from Middle Dutch grau, from Old Dutch grāo, from Proto-West Germanic *grāu, from Proto-Germanic grēwaz, from Proto-Indo-European ǵʰreh₁- — to become green, grow; to grow; to green, to grow.

grou (Afrikaans): grey, ash-coloured; dull white; dull black; very...

Definitions

grey, ash-coloured; dull white; dull black; very...

Ancestry of “grou”, step by step

Step	Language	Word	Meaning
1	Dutch	grauw	grey, not brightly colored, ashen, grubby, grimy;...
2	Middle Dutch	grau	—
3	Old Dutch	grāo	grey
4	Proto-West Germanic	*grāu	grey
5	Proto-Germanic	grēwaz	grey
6	Proto-Indo-European	ǵʰreh₁-	to become green, grow; to grow; to green, to grow

Every word from Proto-Indo-European ǵʰreh₁- →Every word from Proto-Germanic grēwaz →Every word from Proto-West Germanic *grāu →