"thumbing" in the verb sense
1. hitchhike, hitch, thumb
travel by getting free rides from motorists
2. flick, flip, thumb, riffle, leaf, riff
look through a book or other written material
"He thumbed through the report"
"She leafed through the volume"
3. finger, thumb
feel or handle with the fingers
"finger the binding of the book"
Source: WordNet® (An amazing lexical database of English)
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