1. A coarse garnment or cloak; also, coarse clothing, in general. [Obs.] Chaucer. 2. A coarse kind of apron for keeping the clothes clean; a bib. [Prov. Eng. & Scot.] Wright. 3. A child; an offspring; -- formerly used in a good sense, but now usually in a contemptuous sense. "This brat is none of mine." Shak. "A beggar's brat." Swift. O Israel! O household of the Lord! O A...