mezzanine finance
n.— «The group provides what is called mezzanine finance (or mezz in finance industry parlance), a mixture of debt and equity. It earns high interest on the debt part and gets an option on an equity stake which it can cash in when the business is sold on or floated.» —“Demand for Intermediate Capital makes it a buy” Independent (United Kingdom) June 7, 2006. (source: Double-Tongued Dictionary)