/ ˈlɪŋgəʊ; NAmE -goʊ/ noun [ sing. ] ( informal )
1.
a language, especially a foreign language :
He doesn't speak the lingo.
2.
( especially NAmE ) expressions used by a particular group of people
SYN jargon :
baseball lingo
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WORD ORIGIN
mid 17th cent.: probably via Portuguese lingoa from Latin lingua tongue.