Another word for improve on or upon

improve onorupon
Synonyms
WEBSTER’S NEW WORLD® ROGET’S A-Z THESAURUS by Charlton Laird and the editors of Webster’s New World dictionaries. Copyright © 1999 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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MLA Style
"improve on or upon." YourDictionary, n.d. Web. 22 February 2019. <https://thesaurus.yourdictionary.com/improve-on-or-upon>.
APA Style
improve on or upon. (n.d.). Retrieved February 22nd, 2019, from https://thesaurus.yourdictionary.com/improve-on-or-upon