Meaning of “mug” - Learner’s Dictionary

mug

verb [ T ] uk us /mʌɡ/ (present participle mugging, past tense and past participle mugged)

to attack and rob someone in a public place:

[ often passive ] He was mugged as he walked across the park.
mugger noun [ C ]

someone who mugs people

(Definition of “mug verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)