outline vs skyline

outline

verb
  • To draw an outline of. 

  • To optimize for size by replacing repeated code fragments with function calls. 

  • To summarize. 

noun
  • A line marking the boundary of an object figure. 

  • The outer shape of an object or figure. 

  • A prose telling of a story intended to be turned into a screenplay; generally longer and more detailed than a treatment. 

  • A sketch or drawing in which objects are delineated in contours without shading. 

  • A general description of some subject. 

  • A preliminary plan for a project. 

  • A statement summarizing the important points of a text. 

  • A setline or trotline. 

skyline

verb
  • To outline something against the sky. 

  • To filter by means of the skyline operator. 

noun
  • The horizontal silhouette of a city or building against the sky. 

  • A panel on the front page of a newspaper outlining some of the features to be found inside. 

  • The line at which the earth and sky meet. 

  • A path of movement, especially military movement, producing a silhouette above terrain features visible from the location of likely observers. 

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