Outward bound Definition 1 of 2Pro Tip 1/3Maritime Origin Originally used in naval context, often refers to ships starting a journey. The captain announced we were outward bound at dawn. Pro Tip 2/3Not Just Sea Also used metaphorically for any departure, not limited to seafaring. With bags packed, we were outward bound from home. Pro Tip 3/3Journey's Start Emphasizes the initial phase of travel away from the starting point. The outward bound train left the station on time.