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

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1. witch's water: Wiktionary

Definitions from Wiktionary (witch's water) ▸ noun:  (euphemistic) Wiccan holy water ▸ Words similar to witch's water ▸ Usage examples for witch's water ▸ Idioms related to witch's water ▸ Wikipedia articles (New!) ▸ Words that often appear near witch's water ▸ Rhymes of witch's water ▸ Invented words related to witch's water