Keep up
Keep up verb - To keep in good condition.
Usage example: kept the house up while the owners were gone
Maintain
Mutual synonyms
Both terms in one sentence
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Evil Is Easy: It's not easy to keep up against Ethical Divergence and maintain your population's happiness so they don't rebel.
Source: Video Game / Stellaris - This should be especially hard for her to maintain since everyone she meets tends to hate her by default, but she manages to keep up a happy face...somehow.
Source: Neutral Good - She really likes to keep up the mysterious appearance - it helps her maintain her Femme Fatale reputation as well.
Source: Mysterious Informant
Cite this Source
Maintain and Keep up. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/keep_up/maintain
Keep up & Maintain. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/keep_up/maintain>.
Maintain or Keep up. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/keep_up/maintain.
Google Ngram Viewer shows how "keep up" and "maintain" have occurred on timeline