Challenge
Toss up
Mutual synonyms
Cite this Source
Toss up and Challenge. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/challenge/toss_up
Challenge & Toss up. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/challenge/toss_up>.
Toss up or Challenge. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/challenge/toss_up.
Google Ngram Viewer shows how "challenge" and "toss up" have occurred on timeline