Reflect upon
To challenge and reflect upon are semantically related. In some cases you can replace phrase "To challenge" with "Reflect upon", this terms are similar.
To challenge
Reflect upon and to challenge are semantically related. Sometimes you can use "Reflect upon" instead a verb phrase "To challenge".
Cite this Source
To challenge and Reflect upon. (2016). Retrieved 2026, August 08, from https://thesaurus.plus/related/reflect_upon/to_challenge
Reflect upon & To challenge. N.p., 2016. Web. 08 Aug. 2026. <https://thesaurus.plus/related/reflect_upon/to_challenge>.
To challenge or Reflect upon. 2016. Accessed August 08, 2026. https://thesaurus.plus/related/reflect_upon/to_challenge.
Google Ngram Viewer shows how "reflect upon" and "to challenge" have occurred on timeline