Fill
Fill verb - To put into (something) as much as can be held or contained.
Up on
Up on adjective - Being up to particular standard or level especially in being up to date in knowledge.
Both terms in one sentence
- When performed live, the band relies on a choir or their audience to fill those parts of the song with words made up on the spot — or in other words, "canon" lyrics simply don't exist there.
Source: Music / Einstürzende Neubauten -
When her usual guy doesn't show up on time, she matter-of-factly invites Howard to fill in.
Source: Series / Fresh Meat - Zero Punctuation always has a new episode up on Wednesday afternoon (barring holidays, but even then he usually posts a year-in-review clip show to fill the gap).
Source: Schedule Slip / Exceptions
Cite this Source
Up on and Fill. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/fill/up_on
Fill & Up on. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/fill/up_on>.
Up on or Fill. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/fill/up_on.
Google Ngram Viewer shows how "fill" and "up on" have occurred on timeline