at hand vs on the boil

at hand

prep
  • Near; soon 

  • Within easy reach; nearby. 

  • Currently receiving attention. 

on the boil

prep
  • About to happen; imminent. 

  • Playing exceptionally well. 

  • Going smoothly; working well. 

  • continuing; active; in a state of activity or development. 

  • simmering strongly and about to boil. 

  • boiling. 

  • (Of a player taking a pass) running at full speed towards the opposition. 

How often have the words at hand and on the boil occurred in a corpus of books? (source: Google Ngram Viewer )