back up vs shade

back up

verb
  • For a fielder to position himself behind the wicket (relative to a team-mate who is throwing the ball at the wicket) so as to stop the ball, and prevent overthrows. 

  • For the non-striker to take a few steps down the pitch, in preparation to taking a run, just as the bowler bowls the ball. 

  • To move backwards, especially for a vehicle to do so. 

  • To copy (data) so that it can be restored if the main copy is lost. 

  • To undo one's actions. 

  • To fill up because of a backlog. 

  • To halt the flow or movement of something. 

  • To provide support or the promise of support to. 

  • To reconsider one's thoughts. 

  • To move a vehicle backwards. 

  • Coordinate terms: back away, back off, stand back 

shade

verb
  • To move slightly from one's normal fielding position. 

  • To shield (someone or something) from light. 

  • To reduce (a window) so that only its title bar is visible. 

  • To alter slightly. 

  • To vary or approach something slightly, particularly in color. 

  • To darken, particularly in drawing. 

  • To surpass by a narrow margin. 

  • To throw shade, to subtly insult someone. 

  • To shield oneself from light. 

noun
  • Something that blocks light, particularly in a window. 

  • A variety of a colour/color, in particular one obtained by adding black (compare tint). 

  • An aspect that is reminiscent of something. 

  • A very small degree of a quantity, or variety of meaning 

  • A ghost or specter; a spirit. 

  • A subtle variation in a concept. 

  • A postage stamp showing an obvious difference in colour/color to the original printing and needing a separate catalogue/catalog entry. 

  • Subtle insults. 

  • A candle-shade. 

  • A cover around or above a light bulb, a lampshade. 

  • Darkness where light, particularly sunlight, is blocked. 

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