The phrase "stuck one's guns" means to remain firm in one's stand or decision despite opposition or criticism. One synonym for this phrase is "stand one's ground," which means to hold one's position despite pressure or danger. Another synonym for "stuck one's guns" is "hold firm," which means to maintain a determined and unwavering stance. The phrase "refuse to budge" can also be used as a synonym for "stuck one's guns," meaning to steadfastly maintain a position or opinion despite pressure or persuasion. Lastly, "stick to one's guns" can also be used interchangeably, signifying an uncompromising and resolute stance.