make sure of, check into, find out, investigate; see examine 1, guarantee 1.
"make certain (of)." YourDictionary, n.d. Web. 14 July 2019. <https://thesaurus.yourdictionary.com/make-certain-of>.
make certain (of). (n.d.). Retrieved July 14th, 2019, from https://thesaurus.yourdictionary.com/make-certain-of
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