When a hen shows signs of broodiness remove her to the sitting-room.
No special means are taken to break them of broodiness other than not to allow them eggs to sit on.
1510s, "apt to breed," from brood (v.) + -y (2). Figuratively, of persons, from 1851. Also, in modern use, sometimes "full of maternal yearning." Related: Broodily; broodiness.