on somebody's behalf
US /ɑːn ˈsʌmbədiz bɪˈhæf/
UK /ɑːn ˈsʌmbədiz bɪˈhæf/

1.
atas nama, demi
as a representative of someone else
:
•
She accepted the award on her father's behalf.
Dia menerima penghargaan atas nama ayahnya.
•
I'm calling on behalf of my client.
Saya menelepon atas nama klien saya.