To Mug

1. (transitive, obsolete, Britain) To strike in the face.
2. (transitive) To assault for the purpose of robbery.
3. (intransitive) To exaggerate a facial expression for communicative emphasis; to make a face, to pose, as for photographs or in a performance, in an exaggerated or affected manner.
4. (transitive) To photograph for identification; to take a mug shot.^[2]
5. (Britain, Australia, Singapore, slang) To learn or review a subject as much as possible in a short time; cram.