'Péi běn' literally means 'to compensate the capital' — 'péi' (to compensate, make up for) and 'běn' (capital, principal investment). Together, they form a verb meaning to incur a financial loss on an investment or business activity, where revenue falls short of costs. It emphasizes that the original invested money has not been recovered and is instead lost.

This term is commonly used in informal and semi-formal business contexts — for example, when discussing failed ventures, poor sales, or unprofitable products. It carries a slightly negative or regretful tone and often implies miscalculation or bad luck. Unlike more formal accounting terms like '亏损 (kuī sǔn)', 'péi běn' is colloquial and frequently appears in spoken language, news headlines, or small-business conversations. It does not refer to ongoing losses but specifically to a completed transaction or period where the net result is negative.