cover up vs fish out

cover up

verb
  • To conceal or disguise. 

  • To clothe. 

  • To put covers over oneself in bed. 

fish out

verb
  • To search for by rummaging, and then extract (an item from e.g. a container). 

  • To pick up or pull something or someone from (a body of water). 

  • To catch all or nearly all the fish in (a given body of water), so that few or none remain. 

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