Where does “ruche” come from?

ruche (Norman) comes from Old French rusche, from Latin rusca, from Gaulish rusca, from Proto-Celtic rūskos, from Proto-Indo-European HrewH- — to dig.

ruche (Norman): frill

Definitions

frill

Ancestry of “ruche”, step by step

Step	Language	Word	Meaning
1	Old French	rusche	beehive
2	Latin	rusca	bark; nominative/accusative/vocative plural of...
3	Gaulish	rusca	—
4	Proto-Celtic	rūskos	bark
5	Proto-Indo-European	HrewH-	to dig

Every word from Proto-Indo-European HrewH- →Every word from Proto-Celtic rūskos →Every word from Gaulish rusca →