The colloquial phrase "up 'em" is often used to signify a sense of encouragement or motivation, especially in sports or competitive settings. However, there are several synonyms that can convey similar sentiments. "Let's go," "step it up," "push harder," "dig deep," and "rise to the occasion" are a few examples of phrases that can be used instead of "up 'em." These expressions are versatile and can be used in various contexts to urge someone to elevate their performance or take bold action. Whether it's for a presentation, an athletic competition, or a challenging task, these synonyms can effectively convey the sense of drive and motivation needed to succeed.