Middleman

An agent between two parties; a broker; a go-between; any dealer between the producer and the consumer; in Ireland, one who takes land of the proprietors in large tracts, and then rents it out in small portions to the peasantry.

A person of intermediate rank; a commoner.

The man who occupies a central position in a file of soldiers.

a man who buys large quantities of goods and resells to merchants rather than to the ultimate customers