We found 9 dictionaries that define the word idiomatic expression:

General (7 matching dictionaries)

1. idiomatic expression: Vocabulary.com
2. idiomatic expression: Dictionary.com
3. Idiomatic expression: Wikipedia, the Free Encyclopedia
4. idiomatic expression: Rhymezone
5. idiomatic expression: FreeDictionary.org
6. idiomatic expression: Mnemonic Dictionary
7. idiomatic expression: TheFreeDictionary.com

Business (1 matching dictionary)

8. idiomatic expression: Legal dictionary

Computing (1 matching dictionary)

9. idiomatic expression: Encyclopedia

(Note: See idiomatic_expressions as well.)

Definitions from WordNet (idiomatic expression) ▸ noun:  an expression whose meanings cannot be inferred from the meanings of the words that make it up Opposite: literal, straightforward, plain, unfigurative ▸ Words similar to idiomatic expression ▸ Usage examples for idiomatic expression ▸ Idioms related to idiomatic expression ▸ Wikipedia articles (New!) ▸ Words that often appear near idiomatic expression ▸ Rhymes of idiomatic expression ▸ Invented words related to idiomatic expression