The phrase "having case" can be synonymous with several different terms depending on the context. One potential synonym is "having a lawsuit" or "being involved in litigation." Another possible synonym may be "having a legal matter" or "being party to a legal dispute." In criminal law, "having a case" may refer to being under investigation or being charged with a crime. Additionally, in medical terminology, "having a case" can refer to having a specific medical condition or illness. Similarly, in academic or research settings, "having a case" may refer to having a specific data set or research subject matter.