The Oxford Thesaurus An A-Z Dictionary of Synonyms - blotn.

1) stain, spot, mark, smudge, blotch, blemish, disfigurement, smear, smirch, scar, Colloq splodge or US also splotch: An ink blot covered the date of the document. There are a few blots on his record from his time in the army. --v. 2) stain, spot, spatter, smudge, mark, blur: You have blotted these pages where you wrote with a fountain-pen. 3) blot one's copybook. err, destroy or ruin or mar or spoil one's reputation, commit an indiscretion, transgress, sin: She's certainly blotted her copybook by having an affair with that subaltern. 4) blot out. a obscure, conceal, cover (up) , hide, eclipse, dim: The clouds blotted out the sun for a few minutes. b obliterate, destroy, erase, demolish, efface, annihilate, delete, rub or wipe out: He subconsciously blotted out all memory of the accident.