I expect you had a problem too. The salesman knows what he’s talking about - but the rest of us don’t, because we don’t understand all his technical words, or jargon.
Every specialised subject has got its own jargon. Chemistry, maths, geography . . . This book is all about the jargon of English language study. Each sport has its jargon, too. If you don’t know anything about cricket, for instance, words like googly
and third man
will be just as unintelligible as link sprocket
and posterior mechanism
. When a group of specialists are talking together, they use jargon quite naturally, because it helps them to be precise. What’s bad is when they use jargon to people who don’t
know what it means. Can you think of people who might use jargon in this way? Doctors sometimes do. And garage mechanics. And lawyers. Any others?