a game in which players must obey a leader’s instructions if, but only if, they are prefaced with the words ‘O’Grady says’—UK, 1917—game invented during World War One as a play-way for conducting physical exercises and drill in the British Army
the earliest occurrences of ‘feet of clay’, used without explicit reference to the Bible, date from the French Revolution (1789-1799) and translate French ‘pieds d’argile’
nonsense, rubbish—USA, first decade of the 20th century—probably a euphemism for the noun ‘bullshit’, with the noun ‘dust’ used in the sense of ‘rubbish’, ‘garbage’
1910: a cheap and common watch—hence (from 1922 onwards) used in various phrases referring to silliness, reliability/unreliability, erraticism, cheapness, funniness
literally (1845): an enclosure in which calves are isolated from their mothers until weaned—figuratively, humorously and offensively (1885): a girls’ boarding-school—similar to the use of ‘cow’ to derogatorily designate a girl or woman
music characterised by excessive or extravagant riffing—USA, 1975—from ‘riff’ (a short repeated musical phrase) and ‘-orama’ (used to form nouns designating a display, event, etc., of considerable size or expanse)
early 19th century—pandemonium, great trouble or difficulty—often in ‘to kick up hell’s delight’, meaning: to cause a great deal of trouble or difficulty