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Traditionally a type of worthlessness or fragility. Eggshells were also believed to be used in casting spells, and it was thought necessary to crush or break them to prevent this, as recorded by Pliny the Elder (23–79). In the late 16th century, Scot in his Discoverie of Witchcraft (1584) recorded the belief that witches could sail in eggshells.

walk on eggshells be extremely cautious about one's words or actions.

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