The poor murdered girl must be revenged.
I saw the sentence in the dictionary on my cellphone. I doubt the use of 'revenged' in that sentence and I think it should use 'avenged' instead because, as I know, 'revenge' can't take a direct object (as in "she vowed to revenge her brother's death."). But I might be wrong. Any thoughts?
The reason why I was confused is that I found this Grammar Point in Oxford dictionary.
avenge / revenge
Avenge is a verb; revenge is (usually) a noun.
People avenge something or avenge themselves on somebody:She vowed to avenge her brother’s death. He later avenged himself on his wife’s killers. You take revenge on a person.
In more formal or literary English, revenge can also be a verb. People revenge themselves on somebody or are revenged on them (with the same meaning):He was later revenged on his wife’s killers. You cannot revenge something: She vowed to revenge her brother’s death.