Fill up
Fill up verb - Become full.
Flush
Flush verb - To pour liquid over or through in order to cleanse.
Cite this Source
Flush and Fill up. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/fill_up/flush
Fill up & Flush. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/fill_up/flush>.
Flush or Fill up. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/fill_up/flush.
Google Ngram Viewer shows how "fill up" and "flush" have occurred on timeline