judge a book by its cover

Barnaby Rudge

[Cockney slang]judge

blot one's copy book

To damage one's own reputation through bad behavior.

blow someone's cover

To reveal that someone's behavior, situation, or identity has been fabricated or deliberately misrepresented for an ulterior motive.

book burning

Any mass destruction, removal, or recalling of books, motion pictures, broadcasts, or electronic works as a form of censorship, especially motivated by religious or political objections to the material.

book dumping

The practice of donating old used books that burden rather than assist communities.

book in

To check in (to a hotel).

break cover

To disclose one's real thoughts and intentions.

call someone every name in the book

To call someone many abusive names.