UK, 1915—a female worker in a munitions factory, especially during the First World War (1914-18)—from ‘munition’ and the suffix ‘-ette’, denoting women or girls linked with, or carrying out a role indicated by, the first element
also ‘ring (a)round the bath(tub)’—USA, 1914—a dirty water-level mark left on the inside of a bathtub after it has been drained, caused by a combination of hard water and a build-up of soap scum, oils from bath products, etc.
has been colloquially used to express a great variety of notions, in particular ugliness and madness, but also unpleasantness, unpredictableness, agitation, disturbance, etc.
to hurry up (1849 in Charles Dickens’s David Copperfield); the image is of a skater gliding rapidly over an ice surface—also, in early use (USA, 1886): to get drunk; the rolling gait of a drunk person is likened to the swaying motion of an ice skater
‘cauliflower ear’ (USA, 1887)—French calque ‘oreille en chou-fleur’ (1913)—an ear permanently deformed as a result of injuries from repeated blows, as in boxing
to perform outstandingly well—UK, 1902, originally in football: to play an excellent game—the image may be of a footballer whose speed and skill overpower opponents
prostitution—1889 as ‘the most ancient profession in the world’ in On the City Wall, by Rudyard Kipling—was used earlier, with positive connotations, of various professions, especially agriculture
in a state of nudity—1732 as ‘in one’s birthday clothes’—refers to the naked condition in which a person is born—here, ‘birthday’ means ‘the day on which a person was born’
USA, 1888—an enigmatic, mysterious smile, reminiscent of that represented in the Mona Lisa, a portrait of Monna Lisa del Giocondo, painted by Leonardo da Vinci
1923: a small garment worn to cover the genitals—hence (1926): anything intended to conceal something regarded as shameful or indecent—from French ‘cache-sexe’, from ‘cacher’ (to hide) and ‘sexe’ (sex, genitals)