sideway vs slantwise

sideway

adv

  • sideways 

noun

  • A byway. 

  • A footpath near a road. 

adj

  • sidelong 

slantwise

adv

  • diagonally, in a direction or orientation between cardinal axes 

adj

  • diagonal, in a direction or orientation between cardinal axes 

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