We found one dictionary that defines the word overstim:

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1. overstim: Wiktionary

Definitions from Wiktionary (overstim) ▸ noun:  overstimulation ▸ Words similar to overstim ▸ Usage examples for overstim ▸ Idioms related to overstim ▸ Wikipedia articles (New!) ▸ Popular adjectives describing overstim ▸ Words that often appear near overstim ▸ Rhymes of overstim ▸ Invented words related to overstim