The phrase "cock up" usually means a blunder or a mistake. Antonyms for this phrase could include "success," "victory," "triumph," "smooth operation," "flawless execution," "perfection," "impeccable performance," or "seamless integration." These words paint a picture of things going well, with no errors or setbacks. While it's important to acknowledge and learn from our mistakes, it's also important to strive for success and to recognize when things do go smoothly. By using antonyms for "cock up," we can shift our mindset towards positive outcomes and encourage ourselves to aim for the best possible results.