Promise
Promise verb - To make a solemn declaration of intent.
Usage example: they promised to keep in touch with us after they moved away
Undertake is a synonym for promise in guarantee topic. In some cases you can use "Undertake" instead a verb "Promise", when it comes to topics like agree, give one's word.
Mutual synonyms
Related pairs
Common collocations
Both words in one sentence
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In the process, the legend branched out into several variants which modify or expand the original tale: In many vernacular versions an angel commands Brendan to undertake the voyage because Brendan does not believe in the existence of the Land of Promise and has burned a book telling about it.
Cite this Source
Undertake and Promise. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/promise/undertake
Promise & Undertake. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/promise/undertake>.
Undertake or Promise. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/promise/undertake.
Google Ngram Viewer shows how "promise" and "undertake" have occurred on timeline