The phrase "make a hash of" means to do something so badly that it becomes a mess. The antonyms of "make a hash of" can be "succeed", "excel", "thriving", "achieve", and "accomplish". By using these words, we can convey a positive meaning and indicate that a task was well done rather than a failure. In addition, "organize", "improve", "manage", "streamline", and "restructure" can also be antonyms of "make a hash of" as these words suggest the concept of order and improvement rather than chaos and confusion. Using such antonyms can provide a more polished and positive approach to communication.