Word Origin & History
mug"drinking vessel," 1570, "bowl, pot, jug," perhaps from Scand. (cf. Swed. mugg "mug, jug," Norw. mugge "pitcher, open can for warm drinks"), or Low Ger. mokke, mukke "mug."
mug"a person's face," 1708, possibly from
mug (n.1), on notion of drinking mugs shaped like grotesque faces. Sense of "portrait or photograph in police records (e.g. mug shot, 1950) had emerged by 1887. Verb sense of "make exaggerated facial expressions" is from 1855, originally theatrical slang.
mug"to beat up," 1818, originally "to strike the face" (in pugilism), from
mug (n.2). The general meaning "attack" is first attested 1846, and "attack to rob" is from 1864 (mugger in this sense is from 1865). Perhaps influenced by thieves' slang mug "dupe, fool, sucker" (1851).
Related: Mugged; mugging.