(third-person singular simple present underpromises, present participle underpromising, simple past and past participle underpromised)
under- + promise
"underpromise." YourDictionary, n.d. Web. 15 January 2019. <https://www.yourdictionary.com/underpromise>.
underpromise. (n.d.). Retrieved January 15th, 2019, from https://www.yourdictionary.com/underpromise
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