Definitions from Wiktionary ( )

▸ noun:  The short thick digit of the hand that for humans has the most mobility and can be made to oppose (moved to touch) all of the other fingers.
▸ noun:  (graphical user interface) The part of a slider that may be moved linearly along the slider.
▸ noun:  (colloquial, Internet) A thumbnail picture.
▸ verb:  (transitive) To touch or cover with the thumb.
▸ verb:  (transitive, with through) To turn the pages of (a book) in order to read it cursorily.
▸ verb:  (travel) To hitchhike
▸ verb:  To soil or wear with the thumb or the fingers; to soil, or wear out, by frequent handling.
▸ verb:  To manipulate (an object) with the thumb; especially, to pull back the hammer or open the cylinder of a revolver.
▸ verb:  To fire (a single action revolver) quickly by pulling the hammer while keeping the trigger depressed.

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