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English definition of “mug”

mug

noun [C] uk   /mʌɡ/ us  

mug noun [C] (CUP)

A2 a large cup with straight sides used for hot drinks: I made myself a large mug of cocoa (= enough to fill a mug) and went to bed. beer mug mainly US a heavy glass with a handle and usually with patterns cut into its side, out of which you drink beer

mug noun [C] (STUPID PERSON)

mainly UK informal a person who is stupid and easily deceived: He's such a mug, he believes everything she tells him.

mug noun [C] (FACE)

informal mainly disapproving someone's face: his ugly mug

mug

verb [T] uk   /mʌɡ/ (-gg-) us  
to attack a person in a public place and steal their money: He was mugged in broad daylight.
Phrasal verbs
(Definition of mug from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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