Where does “ḱómso-” come from?

ḱómso- (Proto-Indo-European) comes from Proto-Indo-European ḱens-, from Proto-Indo-European ḱem- — to cover, conceal; hornless.

Ancestry of “ḱómso-”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	ḱens-	to announce, to proclaim; to put in order
2	Proto-Indo-European	ḱem-	to cover, conceal; hornless

ḱómso- — Etymology, Origin & Word History | Etymology Explorer