When it comes to the phrase "be coining it," there are a few different synonyms that can be used to convey a similar message. One option might be "raking in the cash," which implies that someone is making a lot of money. Another choice could be "making a killing," which suggests that someone is profiting significantly from a particular endeavor. Another option might be "bringing in the dough" or "pulling in the big bucks," which both have a similar connotation of earning a lot of money. Regardless of the specific synonym used, the idea of "be coining it" is generally focused on making a significant amount of money, often in a relatively short period of time.