Best English dictionary in my opinion is Oxford Dictionary of English. This is default dictionary for Kobo ereader. I don't know a lot about KOReader, but it seems it uses Stardict dictionary. I uploaded my own stardict convertion of ODoE on my brench("Stardict_-_Oxford_Dictionary_of_English.zip" you need to unzip it). I hope it works (it should): https://gitlab.com/grilj.anze/e-reader-dictionaries-kobo-txt/-/tree/d83d17d2d006a13f0b406a6065cb04ae729d6153/
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