thumber

thumb +‎ -er

thumber (plural thumbers)

1. One who thumbs (a book, one's nose, etc.).
   • 2008 April 18, Charles Mcgrath, “The Keeper (See: Steward, Caretaker) of Synonyms”, in New York Times‎:

     Dylan Thomas was another thesaurus thumber, and in his work too the words it supplied were not always improvements.

2. One who thumbs a lift; a hitchhiker.
   • 1932, Bus transportation: Volume 11:

     Several months ago every city and many of the towns in which we operate were flooded with a cartoon flyer warning autoists of the legal risks involved in picking up thumbers.

• Humbert