overpass vs sluff

overpass

verb
  • To disregard, skip, or miss something. 

  • To pass above something, as when flying or moving on a higher road. 

  • To exceed, overstep, or transcend a limit, threshold, or goal. 

noun
  • A section of a road or path that crosses over an obstacle, especially another road, railway, etc. 

sluff

verb
  • ignore, shrug (off) 

  • To play truant from (school). 

  • to avoid working 

noun
  • An avalanche, mudslide, or a like slumping of material or debris. 

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