make certain
idiom
: 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.
Examples of make certain in a Sentence
Recent Examples on the Web
Run your dishwasher on the hottest setting (run your sink on hot for a minute or two first to make certain hot water has reached the kitchen).
—
Patricia Shannon, Southern Living, 10 Nov. 2025
Ongoing studies will need to make certain that the therapy doesn’t cause harm to the liver, where its effects are primarily seen.
—Erika Edwards, NBC news, 8 Nov. 2025
Tapioca starch can also be used as an agent to bind tablets together to make certain medications.
—Kristen Gasnick, Verywell Health, 7 Oct. 2025
Experts have raised concerns that those tariffs could cause supply chain issues and make certain drugs more difficult and expensive to acquire.
—Brett Samuels, The Hill, 26 Sep. 2025
See All Example Sentences for make certain
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Patricia Shannon, Southern Living, 10 Nov. 2025
Ongoing studies will need to make certain that the therapy doesn’t cause harm to the liver, where its effects are primarily seen.
—Erika Edwards, NBC news, 8 Nov. 2025
Tapioca starch can also be used as an agent to bind tablets together to make certain medications.
—Kristen Gasnick, Verywell Health, 7 Oct. 2025
Experts have raised concerns that those tariffs could cause supply chain issues and make certain drugs more difficult and expensive to acquire.
—Brett Samuels, The Hill, 26 Sep. 2025
See All Example Sentences for make certain
Cite this Entry
“Make certain.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/make%20certain. Accessed 4 Dec. 2025.
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