cosy vs snug as a bug in a rug

cosy

adj
  • Warm and comfortable. 

  • Affording comfort and warmth; snug; social 

verb
  • To become friendly with. 

  • To become snug and comfortable. 

noun
  • A padded or knit covering for any item (often an electronic device such as a laptop computer). 

  • A work of crime fiction in which sex and violence are downplayed or treated humorously, and the crime and detection take place in a small, socially intimate community. 

  • A padded or knit covering put on an item to keep it warm, especially a teapot or egg. 

snug as a bug in a rug

adj
  • Very cosy and comfortable. 

How often have the words cosy and snug as a bug in a rug occurred in a corpus of books? (source: Google Ngram Viewer )