The phrase "be off the mark" means to be inaccurate, incorrect, or mistaken. Antonyms for this phrase include accurate, precise, correct, on target, and right on the money. Being on the mark means that you have hit the intended target, delivered the right message, or achieved what you set out to do. Whether it is in sports, business or personal relationships, being on the mark is essential for success. In contrast, being off the mark can lead to confusion, misunderstandings, and failures. Therefore, it is crucial to strive for accuracy and precision in all aspects of life.