Keep on
Keep on verb - Allow to remain in a place or position or maintain a property or feature.
To prolong and keep on are semantically related. In some cases you can replace phrase "To prolong" with "Keep on", this terms are similar.
To prolong
Keep on and to prolong are semantically related. You can use "Keep on" instead a verb phrase "To prolong".
Mutual synonyms
Related pairs
Both terms in one sentence
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You can even keep on purposely avoiding the Blue X to prolong the time it takes for them to stop the kamikaze attacks.
Source: Video Game / Metroid: Fusion
Cite this Source
To prolong and Keep on. (2016). Retrieved 2026, August 09, from https://thesaurus.plus/related/keep_on/to_prolong
Keep on & To prolong. N.p., 2016. Web. 09 Aug. 2026. <https://thesaurus.plus/related/keep_on/to_prolong>.
To prolong or Keep on. 2016. Accessed August 09, 2026. https://thesaurus.plus/related/keep_on/to_prolong.
Google Ngram Viewer shows how "keep on" and "to prolong" have occurred on timeline