The term is a modern American English compound, originating in the early 20th century labor movement. The first element, "union," traces back to the Latin 'unio,' meaning a single entity or unity, which evolved to specifically denote organized labor groups. The second element, "busting," employs the informal, forceful sense of "bust" (to break apart), creating a vivid metaphor. Literally "the breaking of a union," the term logically encapsulates the aggressive strategies used by employers to disrupt labor organization, transforming an abstract concept of unity into a target for deliberate dismantling.

Structure: union (organized association) + busting (act of breaking) - union: From Latin 'unio' (oneness, unity), via Old French. In this compound, it functions as a noun meaning an organized association of workers. - busting: From the verb 'bust' (informal for break or smash), of uncertain origin, possibly a variant of 'burst'. In this compound, it functions as a noun-forming element meaning "the act of breaking or destroying."