/ ˈɑːgəʊ; NAmE ˈɑːrgət; -goʊ/ noun
[ sing. , U ] (from French ) words and phrases that are used by a particular group of people and not easily understood by others
SYN jargon
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WORD ORIGIN
mid 19th cent. (originally denoting the jargon or slang of criminals): from French , of unknown origin.