buck up vs put at ease

buck up

verb
  • To become encouraged, reinvigorated, or cheerful; to summon one's courage or spirits; to pluck up courage. 

  • To pass on to higher authority for resolution. See also pass the buck. 

  • To encourage; to hearten. 

intj
  • Cheer up; take courage; take heart. 

put at ease

verb
  • To evoke or cause someone to be relaxed or calm. 

How often have the words buck up and put at ease occurred in a corpus of books? (source: Google Ngram Viewer )