How To Speak and Write Correctly - Chapter 11. Slang

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Cant （行話 ）：“Cant is the language of a certain class—the peculiar phraseology or dialect of a certain craft, trade or profession, and is not readily understood save by the initiated of such craft, trade or profession. In short, it is an esoteric language which only the initiated can understand.”

Slang （習慣用語）："Slang belongs to no particular class but is scattered all over and gets entre into every kind of society and is understood by all where it passes current in everyday expression. "