hold onto vs hug

hold onto

verb
  • Used other than figuratively or idiomatically: see hold, onto. 

  • To manage to keep something. 

hug

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

  • To stay close to (the shore etc.) 

  • To cling closely together. 

  • 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 hold onto and hug occurred in a corpus of books? (source: Google Ngram Viewer )