We found one dictionary that defines the word overloosen:

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1. overloosen: Wiktionary

Definitions from Wiktionary (overloosen) ▸ verb:  (transitive) To loosen too much. ▸ Words similar to overloosen ▸ Usage examples for overloosen ▸ Idioms related to overloosen ▸ Wikipedia articles (New!) ▸ Words that often appear near overloosen ▸ Rhymes of overloosen ▸ Invented words related to overloosen