We found one dictionary that defines the word dothn't:

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1. dothn't: Wiktionary

Definitions from Wiktionary (dothn't) ▸ verb:  doth not ▸ Words similar to dothn't ▸ Usage examples for dothn't ▸ Idioms related to dothn't ▸ Wikipedia articles (New!) ▸ Words that often appear near dothn't ▸ Rhymes of dothn't ▸ Invented words related to dothn't