Jisho

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Wikipedia definition
1. Pinky swearTo pinky swear, or make a 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 . 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 for sealing a deal.
Read “Pinky swear” on English Wikipedia
Read “ゆびきり” on Japanese Wikipedia
Read “Pinky swear” on DBpedia

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