build up vs magnify

build up

verb
  • To strengthen. 

  • To accumulate, to pile up, to increase in stages. 

  • To close up by building. 

  • In solitaire card games, to place a card over another card of lower value. (e.g., place 5♦ over 4♣) 

  • To erect; to construct. 

magnify

verb
  • To make (something) larger or more important. 

  • To make (something) appear larger by means of a lens, magnifying glass, telescope etc. 

  • To praise, glorify (someone or something, especially God). 

  • To make (someone or something) appear greater or more important than it is; to intensify, exaggerate. 

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