The antonyms for the phrase "slackens pace" include a range of words that describe the opposite of slowing down or reducing the speed or intensity of an activity. Some of the most common antonyms for slackening pace include accelerate, quicken, hasten, speed up, rush, sprint, rev up, and intensify. These words all suggest an increase in tempo or urgency, signaling a sense of urgency or a desire to accomplish a task more quickly. Whether in the workplace or in everyday life, using antonyms for slackening pace can help individuals to be more productive, focused, and efficient, ultimately leading to greater success in achieving their goals.