Where does “brat-cùil” come from?

brat-cùil (Scottish Gaelic) comes from Scottish Gaelic brat, from Old Irish bratt, from Proto-Celtic brattos.

brat-cùil (Scottish Gaelic): backdrop

Definitions

Step	Language	Word	Meaning
1	Scottish Gaelic	brat	cloak, cover, covering, mantle, veil, canopy; mat
2	Old Irish	bratt	cloak; cloth
3	Proto-Celtic	brattos	—

brat-cùil — Etymology, Origin & Word History | Etymology Explorer