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.
A thumbnail picture.
The part of a slider that may be moved linearly along the slider.
To turn the pages of (a book) in order to read it cursorily.
To manipulate (an object) with the thumb; especially, to pull back the hammer or open the cylinder of a revolver.
To hitchhike
To touch or cover with the thumb.
To soil or wear with the thumb or the fingers; to soil, or wear out, by frequent handling.
To fire (a single action revolver) quickly by pulling the hammer while keeping the trigger depressed.
The width of a thumb, as a unit of measure.