Lingua franca - Idioms by The Free Dictionary
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Any language used to bridge the gap between people who do not speak the same language. English is the lingua franca in many foreign tourist destinations.
a ˌlingua ˈfranca (from Italian) a shared language that is used for communication by people whose main languages are different: In the middle of the 20th century, English became the lingua franca of the world. ♢ The majority of our group being South American, we used Spanish as a lingua franca.