blot

[1]	stain , spot , spatter , smudge , mark , blur
[2]	blot one's copybook , err , destroy/ruin/mar/spoil one's reputation , commit an indiscretion , transgress , sin
[3]	blot out , spot , fleck , obscure , conceal , blob , cover (up) , hide , eclipse , dim , obliterate , destroy , erase , demolish , efface , annihilate , delete , rub/wipe out

[1]	smudge , stain , spot , spot , daub , mark , smudge , smear , blotch , smirch , slur , blemish , disfigurement , smear , smirch , scar , (Colloq) splodge/(US) splotch
[2]	smear , smirch , spot , stain