make certain (that) something

make certain (that) something

To check something in order to confirm that it is true, correct, or is happening. I just want to make certain that our meeting is still on tomorrow. Will you make certain that our bags are on the train?
See also: certain, make, something

make ˈcertain (that...)

find out whether something is definitely true: I think there’s a bus at 8 o’clock but you’d better call to make certain.
See also: certain, make