UK, 1951—‘mother-in-law’s chair’, ‘mother-in-law’s cushion’ and ‘mother-in-law’s seat’ are colloquial appellations for the globular spiny cactus Echinocactus grusonii, native to Mexico
USA, 1874—a joke made at the expense of the joke-teller’s (real or fictitious) mother-in-law; this type of joke considered (especially depreciatively) as a genre
a conscientious objector—UK, 1916—from the initial syllable of the noun ‘conscientious objector’ and the suffix ‘-ie’, used to form familiar diminutives
UK, 1832—consolation taken from the fact that a bad situation is not worse than it is—one of several expressions in which the adjective ‘Dutch’ is used derogatorily or derisively
1755: a musical performance in which each participant plays or sings a different tune—1759: a confused or discordant medley—one of several phrases in which the adjective ‘Dutch’ is used derogatorily or derisively
USA, 1949—a person (originally and chiefly a girl or a woman) who is especially talkative—popularised from 1960 onwards by a proprietary name for a child’s talking doll manufactured by Mattel
UK, derogatory—a male van driver, often of a white van, whose driving is selfish and aggressive—1997, in a report issued by the Freight Transport Association