Inside  —n. 1 a inner side. B inner part; interior. 2 side away from the road. 3 (usu. In pl.) Colloq. Stomach and bowels. —adj. 1 situated on or in the inside. 2 football & hockey nearer to the centre of the field. —adv. 1 on, in, or to the inside. 2 slang in prison. —prep. 1 on the inner side of; within. 2 in less than (inside an hour).  inside out 1 with the inner surface turned outwards. 2 thoroughly (knew his subject inside out).