Phrase finder (Cool Find)

A friend of mine asked what "Pushing the envelope" meant. I knew its meaning by use, but not the relevance of the phrase. So we looked it up. It was not what I thought.

So take a guess... then check yourself against
http://www.phrases.org.uk/meanings/push-the-envelope.html

and for a thousand other odd idioms see the phrase megasite:

http://www.phrases.org.uk/meanings/index.html