@kuromusha Decompress the Stardict
Concise Oxford English Dictionary* into its own directory in the directory
dicts in internal storage on your device. The
dicts directory should already be present. The directory for you added dictionary should be created by yourself. The directory name is the name Neoreader wiill use for the dictionary.
If you use Koreader, you can point it to the same directory (/sdcard/dicts) to reuse all the dictionaries for that app, too. You'll need to create a
text file on the right location
_____
*See @ottischwenk for the usual place. There are a _lot_ of concise English dictionaries to choose from.