What's that in human readable form?
You might want to move /var over to the /usr partition as you have lots of room left there.
Do this in linux single
# Move directories around
Make directories for the destination mount point.
[root@tinwhistle root]# mkdir /mnt/destination
Mount your os partitions that you want to copy the directory to on /mnt/destination
Make a directory /mnt/destination/var
Now, cd to /var and pipe it over with tar
[root@tinwhistle root]# cd /var
[root@tinwhistle source]# tar cf - . | (cd /mnt/destinationvar && tar xBfp -)
Now, umount /mnt/destination and make sure you now have a /usr/var directory with the contents of /var in that directory
Now delete the directory /var and make a symbolic link to the new var.
ln -s /usr/var var
Reboot and you should now have more room in /