The phrase "brake one's neck" means to move or act quickly and recklessly, often in the pursuit of success or achievement. Antonyms, or opposite words, for this phrase would include phrases like "take it slow," "move at a leisurely pace," "proceed with caution," or "take the safe route." These phrases suggest a more deliberate approach to achieving goals, one that favors safety, patience, and careful planning over reckless abandon. By using these antonyms, individuals can focus on achieving their goals in a methodical and thoughtful way, rather than risking injury, failure, or other negative consequences.