成倍 (chéng bèi) is an adverb meaning 'by multiples' or 'exponentially'—it describes a change that occurs not by simple addition, but by repeated multiplication (e.g., doubling, tripling, or increasing many times over). The character 成 (chéng) here conveys 'to become' or 'to achieve', while 倍 (bèi) means 'multiple' or 'fold'. Together, they express the idea of 'becoming multiple times greater'. It’s commonly used with verbs like 增加 (zēngjiā, 'increase'), 增长 (zēngzhǎng, 'grow'), or 上升 (shàngshēng, 'rise') to emphasize dramatic, multiplicative growth.

This term appears frequently in economic reports, scientific descriptions, and everyday comparisons where scale matters—such as population growth, data storage demands, or viral spread. Unlike relative terms like 'a lot' or 'much', 成倍 carries precise quantitative weight: it implies at least a two-fold increase, often more, and always signals proportional expansion rather than linear change.