Cost Per Click (CPC) in Adwords is the cost of each click when someone searches and found your PPC ads relevant, this is the price that you pay for the traffic from Google. So if you have a high cost per click, it just means that you have a very competitive keyword and that a lot of your competitors wants a position in the first page of the search result as well.
In my previous post, on High Cost Pay Click, Competitive Market, What To Do!, I shared on how to rectify when you have this situation….