Keep up
Keep up verb - To remain indefinitely in existence or in the same state.
Usage example: let's hope this beautiful weather keeps up for the rest of our vacation
Mutual synonyms
Both terms in one sentence
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They lose all their friends not in the know, and stay in school just to keep up the pretense.
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In fact, Max and Lorelai probably didn't stay together because he couldn't keep up with her, as Dean noted.
Source: Savvy Guy, Energetic Girl -
There's also the episode when a prank from Arnold left Helga temporarily blind, and she decides to keep up the charade so a guilt-ridden Arnold would stay at her side and help her at anything (obviously, she secretly did enjoy having him all for herself too).
Source: Obfuscating Disability
Cite this Source
Stay and Keep up. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/keep_up/stay
Keep up & Stay. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/keep_up/stay>.
Stay or Keep up. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/keep_up/stay.
Google Ngram Viewer shows how "keep up" and "stay" have occurred on timeline