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countable and uncountable, plural lingos or lingoes
(informal) Language, especially language peculiar to a particular group, field, or region; jargon or a dialect. quotations examples
[...] I have Thoughts to tarry a ſmall Matter in Town, to learn ſomewhat of your Lingo firſt, before I croſs the Seas.
1700, [William] Congreve, The Way of the World, a Comedy. […], London: […] Jacob Tonson, […], Act III, scene xv, page 47
"You see, ma'am, I can't divest myself of my professional lingo," observed Mr. Banks.
1846, George W.M. Reynolds, The Mysteries of London, volume 1, London: George Vickers, page 327
She had Lord James' collar in one big fist and she pounded the table with the other and talked a blue streak. Nobody could make out plain what she said, for she was mainly jabbering Swede lingo, but there was English enough, of a kind, to give us some idee.
1913, Joseph C. Lincoln, chapter 12, in Mr. Pratt's Patients