size up vs suppose

size up

verb
  • To evaluate; to estimate or anticipate the magnitude, difficulty, or strength of something. 

  • To wear a larger size of clothing. 

suppose

verb
  • To theorize or hypothesize. 

  • To require to exist or to be true; to imply by the laws of thought or of nature. 

  • To put by fraud in the place of another. 

  • To take for granted; to conclude, with less than absolute supporting data; to believe. 

  • To imagine; to believe; to receive as true. 

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