Get the FREE one-click dictionary software for Windows
or the iPhone/iPad and Android apps
Noun: mug book
Usage: informal
  1. A file of mug shots (pictures of criminals that are kept on file by the police)
    "The detective flipped through the mug book to identify the suspect";
    - mug file

Derived forms: mug books

Type of: data file, file

Encyclopedia: Mug book