(1) Great question. I, too, want to see what others say.
(2) Two of my dictionaries define "mug" as to attack with the intention to rob.
(3) One day I was walking down the street at lunch time. Two prostitutes were
coming toward me. I tried to walk past them, but one of them blocked my way and
said "Give me the money in your pocket." I said nothing and continued to walk. She
then hit me in the head. Fortunately, her "colleague" yelled "Leave that man alone!"
(a) I was not actually robbed, but I think it fair to say that I was mugged.
Student or Learner