a married woman living apart from her husband (18th century)—originally (16th century) an unmarried woman who has borne an illegitimate child—alludes to a bed of grass as a typical place for illicit sexual intercourse
UK—anything which discourages or inhibits sexual activity—originally (1943, British military slang): the sturdy, practical and unattractive underwear issued to female service personnel
a woman whose husband spends much of his spare time playing golf—UK, 1890—refers to the fact that the husband’s repeated absences from the marital home leave his wife feeling neglected
genetically modified food—but had been used earlier by members of Weight Watchers in the sense of food one is addicted to—in reference to ‘Frankenstein; Or, The Modern Prometheus’ (1818), by Mary Shelley
also ‘Frankenstein’—a creation over which the creator loses control, eventually being destroyed by it—UK, 1822—alludes to ‘Frankenstein; Or, The Modern Prometheus’ (1818), by Mary Shelley
a synthesizer designed to be held in the manner of a guitar, with one hand playing a keyboard while the other operates controls on an extended handle—USA, 1979—from ‘key-’ in ‘keyboard’ and ‘-tar’ in ‘guitar’
to intimidate somebody—UK, from 1958 onwards in books by Frank Norman (1930-1980)—also, the noun ‘frightener’ designates a member of a criminal gang who intimidates the victims of its activities
to set someone thinking very hard or seriously, to give someone much food for thought—UK, 1889—loan translation from French ‘donner furieusement à penser’