We found one dictionary that defines the word witch's horse:

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1. witch's horse: Wiktionary

Definitions from Wiktionary (witch's horse) ▸ noun:  Synonym of prairie alligator ▸ Words similar to witch's horse ▸ Usage examples for witch's horse ▸ Idioms related to witch's horse ▸ Wikipedia articles (New!) ▸ Words that often appear near witch's horse ▸ Rhymes of witch's horse ▸ Invented words related to witch's horse