USA, 1990—a method of caring for a premature newborn in which a parent holds the infant on their chest in skin-to-skin contact—from the fact that kangaroos give birth to still-developing foetuses, then nurse them in their pouches
‘to have two left feet’: to be clumsy or awkward—postdates synonymous ‘to have two left hands’ (1815), loan translation of French ‘avoir deux mains gauches’—‘left’ has long been associated with inferior performance, awkwardness and insincerity
UK and Ireland—used of someone who makes a mistake because of poor eyesight—refers to the British optical retail chain Specsavers Optical Group Ltd, in particular to its advertising slogan, ‘should’ve gone to Specsavers’
UK, 1826—a place behind the bony point of the elbow at which a knock results in a sensation of tingling pain—in early use was perhaps partly punning on the homophones ‘humerus’ and ‘humorous’
USA, 1937—an uneasy sensation felt, especially in the stomach, as a result of nervousness or apprehension—based on the notion that the fluttering of butterflies may produce a similar sensation
UK, 1710—in a situation in which any action one takes will have adverse consequences—‘cleft’, past participle of the verb ‘cleave’, means ‘split in two to a certain depth’—the image is of one being squeezed between the stick’s prongs
UK, 1955—‘cobblers’, short for ‘cobbler’s (or cobblers’) awls’, is rhyming slang for ‘balls’, i.e., ‘testicles’, and figuratively ‘nonsense’, ‘rubbish’
African-American, 1966—different things please or satisfy different people—‘stroke’ denotes a comforting gesture of approval or congratulation, and, by extension, a flattering or friendly remark