Where does “brood” come from?

Brood comes from Old English brād, from Proto-Germanic brōduz, from Proto-Indo-European bʰreh₁-, a root meaning to break or spread.

brood (English): The young of certain animals, especially a group...

Definitions

Step	Language	Word	Meaning
1	Middle English	brood	broad
2	Old English	brād	broad, flat, open, extended, spacious, wide,...
3	Proto-West Germanic	braid	broad, wide
4	Proto-Germanic	braidaz	broad, wide

brood — Etymology, Origin & Word History | Etymology Explorer