Crossed fingers
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To cross one's fingers is a hand gesture used to Superstitiously wish for good luck or to nullify a promise. The 'loophole' of crossing one's fingers whilst making a promise is usually exploited by school-aged children.
Crossing one's fingers, by curling the middle finger over the index, is thought to bring good luck. This dates back to when crossed fingers were used as a gesture to ward off witches and others considered to be or possess evil spirits. It is also seen as bad luck to cross your fingers on both hands.
The gesture originates from pre-Christian times and, in many early European cultures, two people were required to use their index fingers to form the sign, one to make a wish and the other to support it. It was believed that the cross was a symbol of unity and that benign spirits dwelt at its intersecting point -- to wish on a cross was a figurative way of securing the wish at the intersection until it came true. Over the years, the custom was modified so one person could make a wish on his/her own.
