Jisho

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(関節)
Wikipedia definition
1. Cracking jointsCracking joints is the action of moving joints to produce a sharp cracking or popping sound. This commonly occurs during deliberate knuckle-cracking. It is possible to crack many joints, such as those in the back and neck vertebrae, hips, wrists, elbows, shoulders, toes, ankles, knees, jaws, and the Achilles tendon area.
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Read “クラッキング (関節)” on Japanese Wikipedia
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