Words and fings...

[Sweder]

According to Chambers Dictionary it's a transitive verb.
What that is I couldn't begin to tell you, other than to suggest it moves around a fair bit and is extremely dodgy.

I checked with the Cambridge Online and got this:

Definition:
revenge: noun [u]
harm done to someone as a punishment for harm that they have done to someone else: She took/got/exacted (her) revenge on him for leaving her by smashing up his car. He is believed to have been shot by a rival gang in revenge for the shootings last week.

revenge: verb [T]
to harm someone as a punishment for harm that they have done to you:
to revenge a death/defeat/injustice [R] The red team revenged themselves on the blue team by winning the semi-final.

Could this be why that little tinker SP threw this up in the first place?
Frankly I'd like to revenge myself on the swine