noun
traveling light and alone; with little luggage and no companion
Describes a way of traveling where one carries minimal belongings and goes by oneself. Often used in contexts like backpacking or solo trips.
彼は空身で世界中を旅している。
He is traveling around the world with just a light pack and no companion.
空身の旅は気楽でいい。
Traveling light and alone is carefree and nice.
Compound of 空 (から, 'empty') and 身 (み, 'body, oneself'), literally 'empty body'. The exact historical derivation is uncertain, but the meaning of traveling without much luggage and alone is a natural extension.