thumb
thumb
noun
The short, thick first digit of the human hand, distinct from other fingers.
"He gave a thumbs-up gesture."
verb
To turn pages quickly with the thumb, often to browse or search.
"She thumbed through the old photo album."
Thesaurus
Synonyms: finger, pollex, hitch, hitchhike, ovolo, quarter round, leaf, flip, riff, riffle, flick