Decline
Decline noun - A change to a lower state or level.
Usage example: the decline of the Roman Empire
Supplement is an antonym for decline.
Supplement
Supplement noun - Something added (as by growth).
Usage example: this new rule restricting e-mail to job-related activity is only a supplement to the preexisting policy regarding personal use of company resources
Decline is an antonym for supplement.
How words are described
Cite this Source
Supplement and Decline. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/decline/supplement
Decline & Supplement. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/decline/supplement>.
Supplement or Decline. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/decline/supplement.
Google Ngram Viewer shows how "decline" and "supplement" have occurred on timeline