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to make certain (that)
01
to check something in order to find out whether it happens or is the case
to make certain of sth
01
to do something just to make sure that something else will occur
Example
The creators of the video game are considering killing off the player's character if they make certain choices.
Black lights emit ultraviolet light, making certain materials glow.
She would have achieved her dreams if she had made certain sacrifices down the line.
