double-jointed
adjective/ˌdʌbl ˈdʒɔɪntɪd/
/ˌdʌbl ˈdʒɔɪntɪd/
- having joints in your fingers, arms, etc. that allow you to bend them both backwards and forwards
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double-jointed
Definition of double-jointed adjective from the Oxford Advanced Learner's Dictionary