join forces
US /dʒɔɪn ˈfɔːrsɪz/
UK /dʒɔɪn ˈfɔːrsɪz/

1.
bergabung, bekerja sama
to combine efforts or resources with another person or group to achieve a common goal
:
•
The two companies decided to join forces to develop a new product.
Kedua perusahaan memutuskan untuk bergabung mengembangkan produk baru.
•
We need to join forces if we want to win this competition.
Kita perlu bergabung jika ingin memenangkan kompetisi ini.