When it comes to finding synonyms for the phrase "sober up," there are many options to choose from, depending on the context. Some alternatives could be "get clear-headed," "regain sobriety," or "become lucid." Another option might be to use more descriptive language like "shake off the effects of alcohol" or "clear the fog from one's mind." In some cases, it might be more appropriate to use informal language like "sober down" or "sober out." Ultimately, the best synonym depends on the situation and audience, but with so many options available, it is easy to find a suitable alternative that fits your needs.