An idiom is defined as a word sequence, i.e. a phrase whose meaning cannot easily be worked out from its individual words or, in other words, is not a 100% literal. The degree of transparency of an idiom can range from almost literal, i.e. easily understood, to the totally obscure, i.e. non-literal and impossible to understand until you look it up in a dictionary or someone explains its meaning...
What’s an Idiom?
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