We found one dictionary that defines the word missharpen:

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1. missharpen: Wiktionary

Definitions from Wiktionary (missharpen) ▸ verb:  To sharpen incorrectly. ▸ Words similar to missharpen ▸ Usage examples for missharpen ▸ Idioms related to missharpen ▸ Wikipedia articles (New!) ▸ Words that often appear near missharpen ▸ Rhymes of missharpen ▸ Invented words related to missharpen