Busy
Busy verb - To hold the attention of.
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
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Alternate Reality: Liam and Augur end up on an alternate Earth where the Taelons are busy conquering humanity.
Source: Series / Earth: Final Conflict -
Some Mooks, instead of following the rules of Mook Chivalry, try getting smart by sneaking up on the hero when he's busy fighting another fellow Mook or while in conversation with someone, and striking him from behind.
Source: Offhand Backhand -
Then while the adults are busy, the bully and her Girl Posse gang up on her, hold her down, and chop off her pigtails.
Source: Traumatic Haircut
Cite this Source
Up on and Busy. (2016). Retrieved 2026, August 08, from https://thesaurus.plus/related/busy/up_on
Busy & Up on. N.p., 2016. Web. 08 Aug. 2026. <https://thesaurus.plus/related/busy/up_on>.
Up on or Busy. 2016. Accessed August 08, 2026. https://thesaurus.plus/related/busy/up_on.
Google Ngram Viewer shows how "busy" and "up on" have occurred on timeline