CVS Checkout issue

[Rishubh Garg]

Hi,
        By CVS checkout of a file we mean : the newest revision 
of the file is extracted from the repository and put in your 
working copy of the module.

But if the file is already there in your working area, i doesn't
overwrite it, rather it shows something like..

 M wlet_demo/system/data.bde

What i want is that i want the latest version of the file from the
repository comes and overwrite the existing file i.e if i edited 
and save a file by mistake, so i want to revert back to the latest
version of the file then what to do?
I'm stuck in that?

Thanks in advance,
-Rishubh