The chengyu (idiom) "喋喋不休" is formed through a descriptive, reduplicative structure where "喋喋" (dié dié) mimics the sound of rapid, incessant speech, essantically onomatopoeic chatter, and is combined with "不休" (bù xiū), which means "not to cease" or "without end". Together, the compound creates a vivid image of nonstop, verbose talking, where the reduplication emphasizes the relentless and tiresome nature of the speech, and the second element reinforces its continuous, unchecked quality. Thus, the entire phrase figuratively portrays someone chattering or complaining endlessly.