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To pinky swear (in some regions referred to as the pinky promise) is when two people entwine their pinky fingers to signify that a promise has been made. It is often seen in anime, where it is called a yubikiri (指切り Japanese for “Finger Cut-off”?). It is also possible for a pinky swear to exist between 3 parties, known as a 3-way pinky promise. A pinky swear between 4 or more people is relatively unknown.
Traditionally, the pinky swear is considered binding and tantamount to a handshake in terms of sealing a deal. The pinky swear originally indicated that the person who breaks the promise must cut off their pinky finger or perform oral sex on the other person. In modern times, pinky swearing is a more informal way of sealing a promise. It is most common among school-age children and close friends. The pinky swear signifies a promise that cannot be broken or counteracted by the crossing of fingers or other such trickery. The Pinky Swear can be broken if all parties agree. Pinky promises are also only valid if all parties agree prior to interlocking pinkies. A pinky swear can however be broken if the majority of candidates chose to break it.