The phrase "turned on waterworks" is commonly used to describe someone crying. However, there are several synonyms that can be used to replace it. For example, "burst into tears," "broke down in tears," "wept uncontrollably," "let the tears flow," or even simply "cried." All of these alternatives are effective ways of conveying the same meaning without repeating the same phrase over and over again. Other phrases such as "bawled their eyes out" or "shed a river of tears" are also more descriptive and can add more emotion to the statement. In any case, using synonyms can help to add variety to your writing and make it more interesting for the reader.