The phrase "draw a blank" means to fail to come up with an answer or an idea when trying to solve a problem or recall information. Some antonyms for this phrase may include "have a breakthrough," "recall instantly," "find an answer," "have a revelation," "strike gold," or "hit the jackpot." Essentially, these terms all represent the opposite of drawing a blank as they imply an immediate recognition of, or solution to, a problem. Finding or knowing the answer can bring relief and satisfaction, while drawing a blank can lead to frustration and disappointment.