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Definition of Mug book
1. Noun. A file of mug shots (pictures of criminals that are kept on file by the police). 
Definition of Mug book
1. Noun. A book containing mug shots, pictures of faces. ¹
¹ Source: wiktionary.com
|  | 
1. Noun. A file of mug shots (pictures of criminals that are kept on file by the police). 
1. Noun. A book containing mug shots, pictures of faces. ¹
¹ Source: wiktionary.com