to retort; to refute
反 · 4 strokes
Pictograph of a hand (又) climbing a cliff (厂). Based on original meaning "climb", now written as 扳. The meaning later shifted to "pull" and "reverse".
驳 · 7 strokes
Phonosemantic compound. 马 represents the meaning and 爻 represents the sound. Simplified form of 駁.