co-sign
US /ˈkoʊˌsaɪn/
UK /ˈkoʊˌsaɪn/

1.
ikut menandatangani, menandatangani bersama
to sign a document jointly with another person or persons
:
•
She asked her father to co-sign the loan application.
Dia meminta ayahnya untuk ikut menandatangani aplikasi pinjaman.
•
You need someone to co-sign if your credit score is low.
Anda membutuhkan seseorang untuk ikut menandatangani jika skor kredit Anda rendah.