Magic Marker vs clapboard

Magic Marker

noun
  • A felt-tip pen. 

clapboard

noun
  • A clapper board; a device used in film production, having hinged boards that are brought together with a clap, used to synchronize picture and sound at the start of each take of a motion picture or other video production. 

  • A narrow board, usually thicker at one edge than the other, used as siding for houses and similar structures of frame construction. 

  • Such boards, arranged horizontally and overlapping with thick edge down, collectively, as siding. 

verb
  • To cover with clapboards. 

How often have the words Magic Marker and clapboard occurred in a corpus of books? (source: Google Ngram Viewer )