The phrase "come hell or high water" is commonly used to describe someone's unwavering commitment to achieving a goal. Synonyms for this phrase might include "at all costs," "by any means necessary," "no matter what," or "come what may." These expressions convey the same sense of determined persistence and the willingness to withstand difficult circumstances in order to achieve a desired outcome. Other variations might include "through thick and thin," "against all odds," or "with grit and determination." Whatever words we use to express our determination and dedication to a task, the important thing is to stay focused and stay the course, regardless of the challenges that may arise along the way.