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double-jointed

/ˌdʌbl̩ˈd͡ʒɔɪntɪd/ adjective

adjective Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about double-jointed at Wordnik → Where our words come from →

  1. Having one or more joints (usually those of the fingers, arms, or legs) able to bend more than is normal; possessing hypermobility of one or more joints.

Origin

PIE word *dwóh₁ From double (adjective) + jointed (adjective), from the fact that a body part of a person with the condition appears to have two joints bending in different directions.

From Wiktionary, via Kaikki.org (CC BY-SA)