In
In adjective - Being in the latest or current fashion.
Up on
Up on adjective - Being up to particular standard or level especially in being up to date in knowledge.
In and up on are semantically related in cognizant topic. Sometimes you can use "In" instead the word "Up on" as an adjective or a preposition.
Cite this Source
Up on and In. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/in/up_on
In & Up on. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/in/up_on>.
Up on or In. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/in/up_on.
Google Ngram Viewer shows how "in" and "up on" have occurred on timeline