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Not to be pedantic, but technically, isn't a phrasal verb an idiom? My co-worker contends that they are different. But if you look at the definition of an idiom, they are actually the same. For example, break down is both a phrasal verb, and it is idiomatic in that the two words can't be looked up individually.
Is a phrasal verb an idiom? 
Re: Is a phrasal verb an idiom? 
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