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In page Knife:

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In Greece, a black-handled knife placed under the pillow is used to keep away nightmares.[citation needed] As early as 1646 reference is made to a superstition of laying a knife across another piece of cutlery being a sign of witchcraft.[8] A common belief is that if a knife is given as a gift, the relationship of the giver and recipient will be severed. Something such as a small coin, dove or a valuable item is exchanged for the gift, rendering "payment."[citation needed]