make bold vs pluck up

make bold

verb
  • To take the liberty; to make free. 

pluck up

verb
  • To remove or acquire by plucking from, for example, the ground; to pick up. 

  • To become more cheerful. 

  • To summon positive emotion (especially courage); to muster. 

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