вступить в брак из-за денег(marry (someone) for (his or her) money: To marry someone solely or primarily to have access to their personal wealth. Given the extreme age difference between them, a lot of people speculated that she was simply marrying Donald for his money. I think it's quite sad that people would marry for money rather than true love of their spouse. thefreedictionary.comAlexander Demidov)
жениться на деньгах(To become wealthy or financially secure by marrying someone who is wealthy or has a wealthy family. Ever since he married into money, George has been flaunting all of the exotic vacations he and his new wife take. During college, when I had barely enough money to eat each day, I vowed that someday I'd marry into money and start living a much more comfortable life. thefreedictionary.comAlexander Demidov)