名詞 middle man:

1. someone who buys large quantities of goods and resells to merchants rather than to the ultimate customers
   同義詞：jobber, middleman, wholesaler
2. the performer in the middle of a minstrel line who engages the others in talk
   同義詞：interlocutor, middleman
3. a person who is in a position to give you special assistance
   同義詞：contact, middleman