Crossword Genius

Green (5)

Ross

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7

(Other definitions for thumb that I've seen before include "Big digit" , "Digit (used for making a hitch?)" , "Hitch ride" , "Hitch-hiking digit" , "Opposable digit" .)

I've seen this clue in The Washington Post, the Penny Press, the L.A. Times Daily, the Evening Standard and The New York Times.
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