"'Course, Grindelwald scarpered. He had a bit of a track record already, in his own country"
- Aberforth (DH28)
To run away.
This may be an example of rhyming slang in which the rhyming word is no longer used (scarper = "Scapa (Flow)"), although it is also attributed to the Italian word scappare, "escape, get away" (NSOED)