Hand over fist is an idiomatic expression that means a rapid and continuous gain or progression in something. It is commonly used to describe the quick accumulation of wealth or profit. Several synonyms for this phrase include "raking it in," "rolling in dough," "making a killing," and "amassing a fortune." These alternative expressions carry the same connotation of swift and lucrative success. Other synonyms for hand over fist include "profiting heavily," "advancing rapidly," and "gaining ground quickly." These phrases can be used interchangeably with hand over fist to describe a situation where a person or business is experiencing exponential growth or success.