When we say "up it", it usually means to increase or improve something. However, there are several other phrases that can be used in its place. One synonym is "step it up", which means to intensify or accelerate efforts. Another is "raise the bar", which refers to setting higher standards or expectations. "Elevate" is also a synonym, highlighting the idea of lifting something to a higher level. "Amplify" can be used as well, which emphasizes making something louder or more significant. Lastly, "enhance" is a synonym that focuses on improving the quality or value of something. All of these phrases can be used interchangeably with "up it".