curl up vs hug

curl up

verb
  • to become coiled or shriveled 

  • to coil or shrivel, make into a coil 

  • to curl, make curly, shape into curls 

  • to become curly 

  • to shape one's body into a somewhat ball-like shape, with one's legs tucked into the abdomen, especially for cosiness or for protection. 

hug

verb
  • To cling closely together. 

  • To stay close to (the shore etc.) 

  • To hold fast; to cling to; to cherish. 

  • To embrace by holding closely, especially in the arms. 

noun
  • A close embrace, especially when charged with such an emotion as represented by: affection, joy, relief, lust, anger, aggression, compassion, and the like, as opposed to being characterized by formality, equivocation or ambivalence (a half-embrace or "little hug"). 

  • A particular grip in wrestling. 

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