The easiest way to store and distribute dictionaries is to keep their files in archives. This saves disk space and allows keeping all dictionary files in a single archive. To archive your dictionary, just put your dictionary's DICT and IDX files (along with an EXT bundle, if your dictionary is multimedia-rich) into a folder and create an archive of that folder using the Mac OS X built-in archiving tool or a third-party archiving utility.
However, it is recommended to use the proprietary dictionary package format developed specially for TranslateIt!. Even though it involves several additional steps, the process of installing dictionaries from packages is very easy and fully automated. To learn all the advantages of using dictionary packages, see Dictionary package format overview.