Brush up
Clear up
Clear up verb - To make plain or understandable.
Cite this Source
Clear up and Brush up. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/brush_up/clear_up
Brush up & Clear up. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/brush_up/clear_up>.
Clear up or Brush up. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/brush_up/clear_up.
Google Ngram Viewer shows how "brush up" and "clear up" have occurred on timeline