Definition of make certain
: to do something or find out something so that one has no doubt about whether something is true, correct, will happen, etc.
Make certain (that) you lock the door when you leave. We must make certain this doesn't happen again. She made certain she thanked each of them for coming.
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“Make certain.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/make%20certain. Accessed 22 Sep. 2021.
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