Longman Dictionary of Contemporary English - mug

~1 n 1 a large cup with straight sides used for drinking tea, coffee etc 2 a large glass with straight sides and a handle, used especially for drinking beer  (rugby players swilling mugs of beer at the bar) 3 also mugful a mug and the liquid inside it  (Two mugs of tea, please.) 4 BrE spoken someone who is stupid and easy to deceive  (I expect they'll find some poor mug to buy their car.) 5 spoken a face  (What an ugly mug!) 6 a mug's game BrE spoken something that is not likely to be successful or profitable  (Gambling is a mug's game, Jonah.) ~2 v mugged, mugging 1 to attack someone and rob them in a public place  (A lot of people won't go out alone at night for fear of being mugged.) 2 AmE informal to make silly expressions with your face or behave in a silly way, especially in a photograph or a play  (Scotty's always mugging for the camera.) mug up phr v BrE informal to study something very hard, especially when preparing for an exam  (mug sth up He's got to mug up some facts about pollution.) + on  (She's mugging up on Racine for her French paper.)