make certain of

US /meɪk ˈsɜːr.tɪn ʌv/

UK /meɪk ˈsɜːr.tɪn ʌv/

1.

to ensure or confirm something

:

•

Please make certain of the details before you submit the report.

•

He wanted to make certain of her safety before leaving.

:

ensure confirm verify ascertain check

:

make certain certain make making make into make for make-up