We found one dictionary that defines the word gather speed:

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1. gather speed: Wiktionary

Definitions from Wiktionary (gather speed) ▸ verb:  Synonym of pick up speed ▸ Words similar to gather speed ▸ Usage examples for gather speed ▸ Idioms related to gather speed ▸ Wikipedia articles (New!) ▸ Words that often appear near gather speed ▸ Rhymes of gather speed ▸ Invented words related to gather speed