oblique vs oblique mark

oblique

noun
  • Synonym of slash ⟨/⟩. 

  • An oblique line. 

  • The oblique case. 

verb
  • To deviate from a perpendicular line; to become askew; 

  • To slant (text, etc.) at an angle. 

  • To march in a direction oblique to the line of the column or platoon; — formerly accomplished by oblique steps, now by direct steps, the men half-facing either to the right or left. 

adj
  • Having the base of the blade asymmetrical, with one side lower than the other. 

  • Disingenuous; underhand; morally corrupt. 

  • Not direct in descent; not following the line of father and son; collateral. 

  • Pertaining to the oblique case (non-nominative). 

  • Not erect or perpendicular; not parallel to, or at right angles from, the base. 

  • Growing at an angle that is neither vertical nor horizontal. 

  • Indirect; employing the actual words of the speaker but as related by a third person, having the first person in pronoun and verb converted into the third person and adverbs of present time into the past, etc. 

  • Not straightforward; obscure or confusing. 

  • Employing oblique motion, motion or progression in which one part (voice) stays on the same note while another ascends or descends. 

oblique mark

noun
  • Synonym of slash ⟨/⟩, sometimes (generally proscribed) inclusive of similar marks such as the backslash ⟨\⟩. 

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