noun
a group of words established by usage as having a meaning not deducible from those of the individual words (e.g., rain cats and dogs, see the light)
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Understanding the meaning behind each idiom is important for language learners.
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Don't take everything he says literally, he's always using idioms.
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She's always dropping cool idioms in her conversations.
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The idiom 'raining cats and dogs' means it's raining heavily.