n. A girth for a horse; especially, a girth separate from the saddle and passing around the body of the horse, retaining in place a blanket, a sheet, or the like, by passing over it.n. The girdle with which a garment, especially a cassock, is fastened. Compare cincture.n. Same as cauda striati (which see, under cauda).To gird or surround with a surcingle, as a horse.To secure by means of a surcingle, as a blanket or the saddle.