'Mug' definitions:

Definition of 'mug'

From: WordNet
noun
The quantity that can be held in a mug [syn: mug, mugful]
noun
A person who is gullible and easy to take advantage of [syn: chump, fool, gull, mark, patsy, fall guy, sucker, soft touch, mug]
noun
The human face (`kisser' and `smiler' and `mug' are informal terms for `face' and `phiz' is British) [syn: countenance, physiognomy, phiz, visage, kisser, smiler, mug]
noun
With handle and usually cylindrical
verb
Rob at gunpoint or with the threat of violence; "I was mugged in the streets of New York last night"

Definition of 'Mug'

From: GCIDE
  • Mug \Mug\ (m[u^]g), n. [Cf. Ir. mugam a mug, mucog a cup.]
  • 1. A kind of ceramic or metal drinking cup, with a handle, -- usually cylindrical and without a lip. [1913 Webster]
  • 2. The face or mouth; as, I don't want to see your ugly mug again; -- often used contemptuously. [Slang] --Thackeray. [1913 Webster +PJC]

Definition of 'mug'

From: GCIDE
  • mug \mug\ (m[u^]g), v. t. To take property from (a person) in a public place by threatening or committing violence on the person who is robbed; to rob, especially to rob by use of a weapon such as a knife or gun.
  • Note: To rob a person or a business indoors is not usually referred to as to mug, but to stick up or hold up.
  • Syn: rob, stick up [WordNet 1.5 +PJC]

Synonyms of 'mug'

From: Moby Thesaurus