Buck up
Buck up verb - To become glad or hopeful.
Spunk up
Cite this Source
Spunk up and Buck up. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/buck_up/spunk_up
Buck up & Spunk up. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/buck_up/spunk_up>.
Spunk up or Buck up. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/buck_up/spunk_up.
Google Ngram Viewer shows how "buck up" and "spunk up" have occurred on timeline