The phrase "to develop a partnership" means to work together with someone or a group in order to achieve a common goal or solve a problem. It involves building a relationship based on cooperation, trust, and mutual support. Full definition
As part of my new position, I was involved in developing partnerships with different biotechnology companies, and I started making new contacts. (sciencemag.org)
We believe in developing a partnership with our clients through good communication, education, and understanding. (nanuetanimalhospital.com)
Moreover, by developing partnerships with animal shelters and other organizations that are not traditionally involved in domestic violence response, we are creating a united community to respond to domestic violence. (thesafehavennetwork.org)