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Please give me the definition of "expressions" as well its categories, if any. Kindly also provide me list of common expressions and their meanings.
A word or group of words used in a particular situation or by particular people: He uses a lot of unusual expressions.
'A can of worms' is an expression which means 'a difficult situation'.
Click on "Idioms" in the column to the left for a list.
Expressions 
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