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

The agreement, approved by Manhattan Federal Judge George Daniels in 2014, required the TLC to make certain 50% of the city’s 13,587 yellow cabs were wheelchair accessible by 2020. —Evan Simko-Bednarski, New York Daily News, 21 Feb. 2024

For example, make certain everyone washes their hands, is current on their vaccines, and is free of cold symptoms when being with your baby. —Jennifer White, Parents, 1 July 2024

Both will make certain spaces unavailable to locals. —Jordyn Noennig, Journal Sentinel, 24 June 2024

The agreement stated Boeing would pay a $2.5 billion settlement and make certain organizational changes in exchange for the Justice Department dropping a fraud conspiracy charge after a period of three years. —Robert Legare, CBS News, 23 June 2024