We found one dictionary that defines the word witches' bells:

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1. witches' bells: Wiktionary

Definitions from Wiktionary (witches' bells) ▸ noun:  The plant foxglove. ▸ Words similar to witches' bells ▸ Usage examples for witches' bells ▸ Idioms related to witches' bells ▸ Wikipedia articles (New!) ▸ Words that often appear near witches' bells ▸ Rhymes of witches' bells ▸ Invented words related to witches' bells