n.
   - a dark mark or stain, especially one made by ink.
 - a thing that mars something that is otherwise good.
 - Biochemistry  a procedure in which proteins or nucleic acids separated on a gel are transferred directly to an immobilizing medium for identification.
 
v.
 (blots, blotting, blotted)
    - dry with an absorbent material.
 - mark, stain, or mar.
 - 
(blot something out)
 obscure a view. 
▸disregard a painful memory or thought.
 - Biochemistry  transfer by means of a blot.
 
 
  Phrase
  
    
      - blot one's copybook
 Brit. tarnish one's good reputation. 
    
   
  Etymology
  ME: prob. of Scand. origin and rel. to ON blettr.