Rough \Rough\, v. t. 1. To render rough; to roughen. 2. To break in, as a horse, especially for military purposes. --Crabb. 3. To cut or make in a hasty, rough manner; -- with out; as, to rough out a carving, a sketch. {Roughing rolls}, rolls for reducing, in a rough manner, a bloom of iron to bars. {To rough it}, to endure hard conditions of living; to live without ordinary comforts.