There are several synonyms for the phrase "gain the day" that can be used to express the same sentiment. Words like triumph, succeed, prevail, conquer, and win can be used interchangeably to describe achieving a victory or accomplishing a goal. Other similar phrases include come out on top, emerge victorious, and carry the day. These expressions convey a sense of overcoming obstacles or challenges, and illustrate the determination and fortitude required to achieve success. Whether in the context of sports, business, or personal endeavors, the feeling of "gaining the day" is a powerful one that inspires us to strive for excellence.