noun

1. A large cup for hot liquids, usually having a handle and used without a saucer.

2. The face, often used deprecatingly.

   “What an ugly mug.”

3. A gullible or easily-cheated person.

   “He's a gullible mug – he believed her again.”

Synonyms: dial, mush, phiz

verb

1. To strike in the face.

2. To assault for the purpose of robbery.

3. 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.

   “The children weren't interested in sitting still for a serious photo; they mugged for the camera.”

adjective

1. Easily fooled, gullible.