(verb-transitive) To sully or defame: a scandal that blackened the mayor's name.
(verb-transitive) 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.
(verb-intransitive) To become dark or black: The day blackened into night.
Although there are two distinct schools of thought on grilled chicken, one that advocates par boiling and one that does not, Mexican cooks do not par boil and are not afraid to let the chicken skin blacken on the outside while the chicken cooks through. - Grilled Chicken: Pollo al Carbon
No doubt the Clinton campaign wants to "blacken" Obama however they can, but do they really want to make Clinton the candidate of the loony racist wing of the Democratic party? - Ferraro's Latest: "They're Attacking Me Because I'm White"
I've just found another person asserting that maybe -- just maybe -- we should have something approaching conclusive evidence before alleging that the Clintons hatched a dastardly and bigoted scheme to "blacken" Obama and provoke a white backlash. - Horses Mouth
The government then played only a small portion of a conversation between Mr. Rock and Mr. Pellicano -- politely leaving out the part of the call in which Mr. Pellicano promises to "blacken" up Ms. Zsibrita and Mr. Rock seems to be on board with the plan. - Allison Hope Weiner: Pellicano Trial: Chris Rock Testifies
If Machen (rhymes with "blacken") isn't widely read today, it's not because his stories have goofy premises -- so does Bram Stoker's yarn about a blood-sucking Transylvanian who sleeps in a coffin. - Arthur Machen's Stories: