Slang, colloquialisms, and idioms are different types of informal language.
Slang: Slang is informal and dynamic language that can vary by group or time period. For example, 'She's a fine girl.' contains informal language.
Colloquialism: Colloquialisms are informal words specific to regions. An example is 'A little bird told me that you're moving to New Jersey.'
Idiom: Idioms are expressions not meant to be taken literally, like 'Holy cow! That dog is big.'
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