Website

❶ http://itools.com/tool/cambridge-international-dictionary-of-idioms 
❷ http://idioms.thefreedictionary.com/ 
❸ http://www.usingenglish.com/reference/idioms/search.php 
❹ http://www.idiomeanings.com/ 
❺ http://www.phrases.org.uk/search.html 
❻ http://www.idiomconnection.com/ 
❼ http://www.learn-english-today.com/idioms/idioms_proverbs.html 
❽ http://onlineslangdictionary.com/ 
❾ http://www.urbandictionary.com/ 
❿ http://www.babylon-software.com/define/87/Online-Slang-Dictionary.html 

เพิ่มเติม        

1-  List of idioms arranged in categories - สำนวนแยกตามประเภท

2-  List of idioms arranged in alphabetical order -สำนวนแยกตามพยัญชนะขึ้นต้น

 eBook dictionary ภาษาพูด สำนวน สแลง

1- 1000 phrasal verbs in context 
2-Business Idioms 
3- 101 American English  Idioms 
4- Confusing English Words-Explained 
5- Longman-essential-idioms-in-english-phrasal-verbs-and-collocations 
6- McGraw-Hill's.Dictionary.of.American.Idioms.and.Phrasal.Verbs 
7- NTC's Thematic Dictionary of American Slang 
8- NTC's Dictionary of American Slang and Colloquial Expressions 
9- Oxford Dictionary of Slang 
10- Oxford Dictionary of Idioms