happy hour vs hush

happy hour

noun
  • A time of day, usually in the afternoon or early evening, when a bar or pub offers its drinks at a discounted price. 

  • Any small gathering, usually in the afternoon or early evening, set aside to relax and have a drink. 

  • Flowers. 

hush

noun
  • A mining method using water 

  • A silence, especially after some noise 

verb
  • To make quiet. 

  • To appease; to allay; to soothe. 

  • To become quiet. 

  • To clear off soil and other materials overlying the bedrock. 

How often have the words happy hour and hush occurred in a corpus of books? (source: Google Ngram Viewer )