make certain see under ↑make1
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Main Entry: ↑certain
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make certain phrase
to take action in order to be sure that something happens or to be sure that it is true
Thesaurus: to become more definite, or to make something more definitesynonym
Main entry: certain
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[with clause] take action to ensure that something happens or is the case
I made certain that our paths would never cross again
■ establish whether something is definitely correct or true
he probably knew her, but it didn't do any harm to make certain
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make certain
: to do something or find out something so that you have no doubt about whether something is true, correct, will happen, etc.
Make certain (that) you lock the door when you leave. = Make certain to lock the door when you leave.
We must make certain [=make sure] this doesn't happen again.
She made certain she thanked each of them for coming.
— sometimes + of
Make certain of your flight times [=be sure that you definitely know your flight times] before you leave for the airport.
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Main Entry: ↑certain
Useful english dictionary. 2012.