hitchhiker’s thumb
 n.— «A common trait among people with diastrophic dysplasia is what’s called a “hitchhiker’s thumb,” which prevents Johnson from being able to open or close her fingers or grip objects.» —“Transcending impossibilities” by Tina Firesheets News-Record (Greensboro, North Carolina) June 24, 2006. (source: Double-Tongued Dictionary)

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