Up and Under

Up

Up adjective - Being at a higher level than average.
Usage example: the level of the lake is up this spring

Under is an antonym for up.

Under

Under adverb - In or to a lower place.
Usage example: crouch down under where they won't see you

Up is an antonym for under in topics: below, secondary.
Cite this Source
Under and Up. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/up/under
Up & Under. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/up/under>.
Under or Up. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/up/under.
Google Ngram Viewer shows how "up" and "under" have occurred on timeline