Definition of "idiomatic expression" []

• An expression whose meanings cannot be inferred from the meanings of the words that make it up (noun)

WordNet. Princeton University. 2010.

• "[270] This is the meaning of the idiomatic expression (...) (ek tou mesou genetai)."
• "It should not be overlooked that v. 3 begins with an idiomatic expression frequently used when details are to be introduced, the expression, namely, "and it came to pass" (wayhi)."