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I recommend the following link which contains hundreds of idioms from a to z:
Dictionary of English Idioms & Idiomatic Expressions
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Online DictionariesAn idiom is a phrase where the words together have a meaning that is different from the dictionary definitions of the individual words, which can make idioms hard for ESL students and learners to understand. Here, we provide a dictionary of 2,163 English idiomatic expressions with definitions.
http://www.usingenglish.com/reference/idioms/
For example:
A rolling stone gathers no moss
People say this to mean that a person who is always moving around doesn't acquire many possessions.
I hope I can help.