ditch vs sag off

ditch

verb
  • To deliberately not attend classes; to play hookey. 

  • To dig ditches around. 

  • To dig ditches. 

  • To throw into a ditch. 

  • To discard or abandon. 

  • To deliberately crash-land an airplane on water. 

noun
  • A trench; a long, shallow indentation, as for irrigation or drainage. 

  • A raised bank of earth and the hedgerow on top. 

sag off

verb
  • To skive; to fail to attend school when required to do so. 

  • Used other than figuratively or idiomatically: see sag, off. 

  • To back off from an opponent against whom one is defending. 

  • To move too far leeward when sailing on the wind. 

  • To fall in share price. 

How often have the words ditch and sag off occurred in a corpus of books? (source: Google Ngram Viewer )