The phrase "cleaned up on" means to make a lot of money or success. However, there are several antonyms that can be used to indicate the opposite. One antonym could be "struggled," which means to have difficulty in achieving success or making money. Another antonym could be "lost," meaning to have incurred a financial loss or failed to achieve success. Additionally, "declined" could also be an antonym, indicating a decrease in profitability or success. Lastly, "missed out" can be an antonym, indicating the failure to take advantage of a particular opportunity or situation. These antonyms highlight the negative outcomes that can occur when one doesn't succeed at "cleaning up on.