/ ˈmɪdlmæn; NAmE / noun ( pl. -men / -men; NAmE /)
1.
a person or a company that buys goods from the company that makes them and sells them to sb else :
Buy direct from the manufacturer and cut out the middleman .
2.
a person who helps to arrange things between people who do not want to talk directly to each other
SYN intermediary , go-between