thumb (EN)
noun, verb

noun “thumb”

sg. thumb, pl. thumbs
  1. the part of the hand that is thick and short, which moves more than the other fingers and can touch each of them
    She used her thumb to press the button on the remote control.
  2. (in graphical user interface) the movable part of a sliding control that you can move up and down or side to side
    Drag the thumb on the volume slider to the right to increase the sound.
  3. (colloquial) a small version of a picture used for quick viewing
    I scrolled through the video thumbs to find the tutorial I needed.

verb “thumb”

thumb; he thumbs; past thumbed, part. thumbed; ger. thumbing
  1. to press or touch something with the thumb
    She thumbed through the pages of the book, looking for the chapter she wanted to read.
  2. to make something dirty or worn out by touching or handling it a lot with the thumb or fingers
    After reading her favorite book every night for a year, she had thumbed the pages until they were soft and worn.
  3. to travel by getting free rides from passing vehicles, signaling them by sticking out your thumb
    After running out of gas in the middle of nowhere, we decided to thumb a ride to the nearest town.
  4. to quickly look through a book by flipping the pages with the thumb
    She thumbed through the magazine quickly, looking for the article she wanted to read.