(third-person singular simple present instrengthens, present participle instrengthening, simple past and past participle instrengthened)
in- + strengthen; compare enstrengthen
"instrengthen." YourDictionary, n.d. Web. 16 January 2019. <https://www.yourdictionary.com/instrengthen>.
instrengthen. (n.d.). Retrieved January 16th, 2019, from https://www.yourdictionary.com/instrengthen
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