We found one dictionary that defines the word mistighten:

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1. mistighten: Wiktionary

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