The word 反驳 is formed through the compounding of two semantically related characters: 反 (fǎn), which means "to oppose" or "to be against", and 驳 (bó), which means "to refute", "to dispute", or "to argue against". Together, they create a verb-object (动宾) structure where 反 acts as an adverbial modifier meaning "in opposition", and 驳 is the core verb meaning "to refute". This combination produces a compound verb meaning "to rebut", "to retort", or "to counter-argue", where the action of refuting is performed in a contrary or opposing manner against a prior statement or claim. The formation is a classic example of how modern Chinese builds precise vocabulary by logically combining meaningful monosyllabic morphemes.