noun

1. Obsolete the specialized vocabulary and idioms as of criminals and tramps, the purpose of which was to disguise from outsiders the meaning of what was said: now usually called cant
2. the specialized vocabulary and idioms of those in the same work, way of life, etc.: now usually called shoptalk, argot, jargon
3. highly informal speech that is outside conventional or standard usage and consists both of coined words and phrases and of new or extended meanings attached to established terms: slang develops from the attempt to find fresh and vigorous, colorful, pungent, or humorous expression, and generally either passes into disuse or comes to have a more formal status

Etymology: 18th-c. cant < ?

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