The verb 'tramp' entered Middle English from a Middle Low German source, such as 'trampen', meaning "to stamp, tread." This, in turn, is believed to be of onomatopoeic origin, imitating the sound of heavy, rhythmic footsteps. The semantic evolution is direct and sensory: the sound and action of heavy treading gave rise to the verb's core meaning. From this action, the noun naturally developed, first describing the act of tramping, then extending to describe the itinerant person whose defining characteristic is walking from place to place. The word's journey is a clear example of how a sound-imitative root in a Germanic language solidified into a common English term for purposeful, often weary, travel on foot.

The word 'tramp' is a simplex word of Germanic origin. It functions as a whole, unanalyzable unit in modern English, representing both the action and the person performing it.