The phrase "going flat out" can be used to describe giving maximum effort or working at the highest pace. There are numerous synonyms for this phrase that can be used interchangeably, including giving it your all, pushing yourself to the limit, putting your nose to the grindstone, working at full tilt, and going all out. Other phrases include leaving no stone unturned, exerting oneself to the utmost, and working tirelessly. These synonyms can be used in various contexts, such as in a work environment, while studying, or while pursuing a personal goal. Whatever the situation, these alternatives for "going flat out" convey a sense of determined effort and commitment.