7000多条习语的在线版剑桥习语词典，横跨英美及澳大利亚的真实英语 http://idioms.thefreedictionary.com/
The idiom dictionary is compiled from the Cambridge International Dictionary of Idioms and the Cambridge Dictionary of American Idioms.
The Cambridge International Dictionary of Idioms explains over 7,000 idioms current in British, American and Australian English, helping learners to understand them and use them with confidence. The Cambridge Dictionary of American Idioms, based on the 200 million words of American English text in the Cambridge International Corpus, unlocks the meaning of more than 5,000 idiomatic phrases used in contemporary American English. Full-sentence examples show how idioms are really used.