quid pro quon /ˌkwɪd prəʊ ˈkwəʊ $ -proʊ ˈkwoʊ/ noun (plural quid pro quos) [countableC] EXCHANGEsomething that you give or do in exchange for something else, especially when this arrangement is not officialquid pro quo for There’s a quid pro quo for everything in politics – you’ll soon learn that.
quid pro quo• It is clearly illegal to require sex as a quid pro quo for promotion.
→ quid pro quo at quo(1)