A book jacket blurb is a short description of a book that appears on the back or inside cover of the book. It is usually written by the publisher and is intended to give potential readers an idea of what the book is about. The crossword solutions for the term 'book jacket blurb' are BIO (3 letters) and RAVE (4 letters). A BIO is a short biography of the author, while a RAVE is a highly enthusiastic review of the book.