Posted by Mark Webber on November 14, 2007
In Reply to: Half posted by Leon on November 14, 2007
: Hi, I am looking for the meaning of the phrase. You don't know the half of it!
In other words, you know less than half of what there is to know about this situation. The phrase can be used to indicate to someone that there is much more to be revealed about a situation than they had thought.