"thumb"

 The word "thumb" can be used as both a noun and a verb in English.

As a noun:

• Anatomy: The short, thick finger on the side of your hand that makes it possible to hold and pick things up easily.
  • Example: "I accidentally hit my thumb with the hammer."
• Part of a glove or mitten: The part that covers the thumb.
  • Example: "My mitten has a hole in the thumb."

As a verb:

• To turn over pages: To leaf through (pages) with the thumb.
  • Example: "He thumbed through the book."
• To travel by thumbing rides: To hitchhike.
  • Example: "She thumbed her way to New York."
• To request or obtain (a ride) in a passing automobile by signaling with the thumb.
  • Example: "He thumbed a ride to school."
• To soil or wear by or as if by repeated thumbing.
  • Example: "A badly thumbed book"

Some common phrases using "thumb":

• All thumbs: Extremely awkward or clumsy.
• Under one's thumb: Under control; in a state of subservience.
• Thumb one's nose: To express disdain or defiance.
• Thumbs up/down: Used to show that something has been accepted/rejected or that it is/is not a success.

I hope this helps! Let me know if you have any other questions.