Slang is a type of language used by a particular group of people—e.g., teenagers—or by people in a particular occupation—e.g., members of the army. It can act as a kind of code: using slang creates a sense of identity or belonging among members of the group and effectively excludes outsiders. it's better to avoid using this sort of language in general contexts as people outside the group in question may not understand it, or may well interpret it wrongly.

Slang terms are often very short-lived: most of them will never become well established. But some do pass into standard English over time. Here are some examples of terms that started life as slang but are now part of everyday language:

Word Meaning Original use
chum a friend members of Oxford University
crony a close friend or companion members of Cambridge University
slush fund a reserve of money used for illicit purposes sailors
pluck courage boxers
jamboree a big party or celebration in the USA
ginormous huge soldiers

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Grammar and usage