The phrase "buy your risk" typically means to take on a potential financial loss when making a purchase or investment. However, there are a number of synonyms that can be used to convey similar meanings. "Assume your risk" or "accept your risk" suggest a willingness to take on potential consequences. "Take your chance" implies a bit more uncertainty and a willingness to gamble on an outcome. "Shoulder your risk" or "bear your risk" suggest a sense of responsibility for any potential losses. Ultimately, no matter which synonym is used, the underlying message is the same: be aware of potential risks and be willing to accept them before making a purchase or investment.