The word 'stumping' derives from the verb 'stump', which originally referred to the remaining base of a tree after it has been felled. In 19th-century American political culture, candidates would literally stand on tree stumps to deliver speeches in rural areas, giving rise to the figurative sense of 'traveling and making political appeals'. The sense of 'puzzling' connects to the idea of being confronted with an obstacle as immovable as a tree stump. The '-ing' suffix solidifies these actions into a noun, capturing the ongoing process of campaigning, walking heavily, or causing bafflement.

Structure: stump (to campaign or puzzle) + ing (noun-forming suffix) stump: From Middle English stumpe, of Germanic origin, related to German Stumpf. In this context, it functions as a verb root meaning to campaign by making speeches or to perplex. ing: A suffix of Old English origin used to form nouns from verbs, indicating an action or process.