make certain of
US /meɪk ˈsɜːr.tɪn ʌv/
UK /meɪk ˈsɜːr.tɪn ʌv/

1.
memastikan, memastikan kebenaran
to ensure or confirm something
:
•
Please make certain of the details before you submit the report.
Harap pastikan detailnya sebelum Anda menyerahkan laporan.
•
He wanted to make certain of her safety before leaving.
Dia ingin memastikan keselamatannya sebelum pergi.