"Going to the mat" is a common phrase often used to describe a person's willingness to fight or stand up for something they believe in. However, there are many synonyms that can be used to convey a similar meaning. For instance, phrases like "taking a stand," "getting into the ring," "being steadfast," and "challenging the status quo" all convey the sense of fighting for something one believes in. Other synonyms might include "holding one's ground," "refusing to back down," or "standing up for oneself." No matter what phrase is used, the important thing is to ensure that one's passion and conviction shine through in the way that they speak or act.