make certain
US /meɪk ˈsɜːr.tən/
UK /meɪk ˈsɜːr.tən/

1.
memastikan, menjamin
to ensure something; to take action so that something is certain to happen
:
•
Please make certain that all windows are closed before you leave.
Tolong pastikan semua jendela tertutup sebelum Anda pergi.
•
I need to make certain I have enough money for the trip.
Saya perlu memastikan saya punya cukup uang untuk perjalanan.