1) First of all, a few exercises to get acquainted with the use of a paper dictionary.

   
2) A very interesting online dictionary, but actually much more. Use the possibilities offered by the "Forum" feature to translate the trickiest phrases. Wordreference.com
   

3) "George W. Bush - AWOL from the National Guard 1972-'73" "Family needs housing ASAP."

Wonder what those abreviations or acronyms stand for? Check them at ...


Acronymfinder.com
   
4) "Arkansas" You think you know how to pronounce this word? Better check it at Merriam-Webster Online Merriam-Webster Online

 

5) Merriam-Webster again. This time something more visual.

Merriam-Webster Visual dictionary

6) The sounds of English with interactive phonetics chart. BBC Learning English

7) Urban Dictionary:

Ever heard of a "chairdrobe"? Take a look at this online slang and neologism dictionary that list a lot of things you may not be able to find in a traditional dictionary.

Urban Dictionary