When it comes to standing firm and not giving up on one's beliefs or opinions, there are a variety of synonyms for the phrase "stick one's guns." Some possible options include "hold fast," "stay the course," "remain steadfast," "dig in one's heels," "cling to one's position," or simply "stand one's ground." All of these phrases suggest a firm commitment to a particular viewpoint, despite any opposition or challenges that may arise. Whether in a personal or professional context, being able to "stick one's guns" can be a valuable trait that demonstrates strength of character and conviction.