palimpsest

As a noun palimpsest

is palimpsest.

As a verb expurgate is

to edit out rude, incorrect, offensive, useless, or otherwise undesirable information from a book, cd or other publication; to cleanse; to purge.

As a noun palimpsest

is palimpsest.

As a verb plagiarize is

(transitive'' or ''intransitive ) to use, and pass off as one's own, someone else's writing/speech.