We found one dictionary that defines the word overgesture:

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1. overgesture: Wiktionary

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