Meaning

noun the young of an animal cared for at one time

verb think moodily or anxiously about something

verb hang over, as of something threatening, dark, or menacing

originFrom Middle English brood, brod, from Old English brōd (“brood; foetus; breeding, hatching”), from Proto-Germanic *brōduz (“heat, breeding”), from Proto-Indo-European *bʰreh₁- (“breath, mist, vapour, steam”).

Etymology from Wiktionary, CC BY-SA 3.0