bowing vs thumbs up

bowing

noun
  • The act of bending at the waist, as a sign of respect or greeting. 

  • A technique for using the bow on a string instrument such as a violin. 

  • A bending. 

thumbs up

noun
  • A gesture signifying approval or okay; a thumb pointing up out of a fist. 

  • An approval or okay. 

How often have the words bowing and thumbs up occurred in a corpus of books? (source: Google Ngram Viewer )