"Stick to one's guns" is an idiomatic expression that means to refuse to change one's beliefs or actions, despite opposition or pressure to do so. There are other phrases that can be used instead of "stick to one's guns," including "stand one's ground," "hold firm," "remain steadfast," and "stay the course." Each phrase emphasizes a commitment to one's beliefs or principles, even in the face of adversity. By refusing to compromise or back down, one can show strength and determination in their convictions. It's important to stay true to oneself and to stand up for what is right, and these synonyms for "stick to one's guns" capture this sentiment perfectly.