black·en (blāk'ən) v.
black·ened, black·en·ing, black·ens
v.
tr.
To make black.
To sully or defame: a scandal that blackened the mayor's name.
To coat (fish or meat, for example) with pepper and other spices and then quickly sear in a very hot skillet, thereby producing meat that is black on the outside but tender on the inside.
v.
intr. To become dark or black: The day blackened into night. black'en·er n.