hand over fist

The phrase "hand over fist" is an idiomatic expression that means to make money or progress rapidly and continuously. It suggests the idea of earning or gaining something quickly and easily, often with increasing momentum or success. The metaphorical comparison is drawn between the fast, repetitive motion of one's hand moving over the other in a grabbing motion, similar to making consecutive fistfuls, and the swift accumulation or advancement in a particular endeavor.