blackened (Adjective) — Darkened by smoke. ex. "blackened rafters"
blackened (Adjective) — (of the face) made black especially as with suffused blood. ex. "a face blackened with fury"
blackened (Verb) — Make or become black. ex. "The smoke blackened the ceiling" ex. "The ceiling blackened"
blackened (Verb) — (cooking) burn slightly and superficially so as to affect colour. ex. "The cook blackened the chicken breast"