What is another word for joining up with?
Pronunciation: [d͡ʒˈɔ͡ɪnɪŋ ˈʌp wɪð] (IPA) 
When you team up with someone or something, you are forming a partnership or alliance. To collaborate with others, you might unite, merge, or fuse with them. To work together, you could cooperate, coordinate, or pool resources. Conversely, if you choose to oppose or compete with others, you might confront, clash, or challenge them instead. Additionally, some other words you could use to describe joining up with someone or something include aligning, integrating, amalgamating, and banding together. Ultimately, the synonym you choose to use will subtly affect the tone and connotation of your message, so it is important to choose the one that best fits your intended meaning.
