* The Idioms Dictionary (http://www.theidioms.com/) is a comprehensive dictionary of idioms, with definitions, examples, and usage notes.
* The Phrase Finder (http://www.phrases.org.uk/) is a searchable database of idioms, phrases, and other expressions, with information about their origins and usage.
* Wiktionary (https://en.wiktionary.org/wiki/Main_Page) is a free online dictionary that includes idioms, with definitions, examples, and usage notes.
* YourDictionary (http://www.yourdictionary.com/) is a free online dictionary that includes idioms, with definitions, examples, and usage notes.
* The Online Slang Dictionary (http://www.urbandictionary.com/) is a user-generated dictionary of slang words and phrases, including idioms.