There are various synonyms for "initiate a case" depending on the context of its use. Some alternatives for this phrase include "commence legal proceedings," "file a lawsuit," "trigger a lawsuit," "start legal action," "launch a legal dispute," and "begin legal action." These synonyms can be used interchangeably depending on the legal language and the specific circumstances of the case. However, it is essential to note that the use of each term may also have unique legal implications that require careful consideration. Regardless of the phrase used, the core meaning is that the legal dispute is just beginning, and the formal process of justice has been set in motion.