The phrase "one-up" is commonly used to indicate that someone has surpassed or outdone someone else in a competition or comparison. However, if you want to change up your vocabulary and avoid repetition, there are many synonyms you can use. For instance, you can say that someone "topped," "surpassed," "outshone," "exceeded," "outperformed," "outmaneuvered," "outclassed," "outsmarted," "outmatched," or "outpaced" someone else. All of these words convey the idea of being better at something than someone else, and can add variety and nuance to your writing or speech. So don't feel like you have to stick to the same old "one-up" every time - explore the full range of synonyms at your disposal!