To sit on eggs, or to worry
Since a hen will sit on eggs that other hens have laid, you aren't limited in ... Don't 
worry about the broody hen going unbroody while you wait to... [DOC] [TLE] Brood - definition of brood by The Free Dictionary [PAR] To focus the attention on a subject persistently and moodily; worry: brooded 
about his future; brooded over ... 3. to sit upon (eggs) to hatch, as a bird; incubate.