If you go to the download section of dict.cc, you can download offline dictionaries.
I have not tried this with Windows or Linux, but on a Mac, you can download the dictionary for Mac OS X 10.6 (works on 10.7 and 10.8 too). Once you download the file linked here for convenience, you have two choices:
- You could just double click the package installer and let it do it’s thing.
- You could manually install the dictionary file by first extracting it from the .pkg file and following my instructions below.
Put the extracted file in this folder (the package installer does this for you):
To get there, you could click finder>Go To> type in the path and press enter. Paste dict.cc file in there.
You should be able to start your build-in dictionary program and go to the preferences, search the list and check the dictionary to enable it. You can also optionally drag the dictionary up the list to give it higher priority if you plan on using it frequently.