sponsor

(noun) someone who supports or champions something. Synonyms: patron, supporter.

(noun) an advocate who presents a person (as for an award or a degree or an introduction etc.). Synonyms: presenter.

(verb) assume sponsorship of. Synonyms: patronize, patronise.

(verb) assume responsibility for or leadership of. Example: "The senator announced that he would sponsor the health care plan."

(verb) do one's shopping at; do business with; be a customer or client of. Synonyms: patronize, patronise, shop, shop at, buy at, frequent.