Brought up the rear is a phrase that indicates being at the back, finishing last, or being the least successful. Its antonyms would be leading the pack, coming in first, or achieving the most success. Another antonym could be being in the forefront or being the front runner. Brought up the rear can also have a negative connotation, implying failure or lack of skill, whereas its antonyms carry a more positive tone. In summary, while brought up the rear may indicate being at the back, its antonyms can represent success, leadership or coming in first place.