Keep at
Prolong
Prolong verb - To make longer.
Keep at and prolong are semantically related. Sometimes you can use "Keep at" instead a verb "Prolong".
Nearby Words: prolongation, prolonging
Mutual synonyms
Cite this Source
Prolong and Keep at. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/keep_at/prolong
Keep at & Prolong. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/keep_at/prolong>.
Prolong or Keep at. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/keep_at/prolong.
Google Ngram Viewer shows how "keep at" and "prolong" have occurred on timeline