The phrase "putting money on" refers to placing a bet or making a wager. There are several synonyms that can be used to express the same idea. One phrase commonly used is "gambling on," which also implies a certain level of risk and uncertainty. Another option is "betting on," which is more specific and straightforward. "Staking" is also a word that can be used when talking about putting money on something, as it conveys the idea of investing and supporting a particular outcome. "Backing" is another synonym, which suggests support and belief in a particular outcome or event. Whatever the synonym used, it is important to remember that putting money on anything carries risks and is not always a wise decision.