Join issue is a phrase that means to engage in a legal dispute or argument. There are several synonyms for this phrase, including "enter into controversy," "dispute," "debate," "contest," "litigate," and "contend." Each of these synonyms carries a slightly different connotation, but all are related to the concept of two parties engaging in a legal or verbal battle over an issue or topic. Whether in a courtroom or a debate, joining issue requires skill, knowledge, and conviction to effectively make arguments and counterarguments. No matter what synonym is used, the act of joining issue is a crucial component of any legal or intellectual debate and is essential to reaching a fair and just resolution.