Before
Before adverb - So as to precede something in order of time.
Upon and before are semantically related. In some cases you can use "Upon" instead a preposition "Before".
Upon
Upon preposition - In or into contact with.
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Synonyms for Upon
Before and upon are semantically related. Sometimes you can use "Before" instead a preposition "Upon".
Mutual synonyms
Both words in one sentence
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Every other Megatron since has yelled it upon discovering Starscream's betrayal - before embarking on a Roaring Rampage of Revenge over said backstabbing.
Source: Internal Homage - You'll spend hours upon hours upon hours winning the same rings over and over again before you probably just give up and content yourself with 99% completion.
Source: That One Sidequest -
For twenty-plus episodes, Pike was far behind the rest of Vox Machina... until she eventually caught up upon reaching level 12 before they fought Kevdak and the Herd of Storms.
Source: Web Video / Critical Role
Cite this Source
Upon and Before. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/before/upon
Before & Upon. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/before/upon>.
Upon or Before. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/before/upon.
Google Ngram Viewer shows how "before" and "upon" have occurred on timeline