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
1910: a cheap and common watch—hence (from 1922 onwards) used in various phrases referring to silliness, reliability/unreliability, erraticism, cheapness, funniness
Australia, 1970—as a noun and as a verb, refers to a high-speed drive in a motor vehicle—from the surname of the Argentinian motor-racing driver Juan Manuel Fangio
is used of a place that is found inexplicably deserted; also of a person’s sudden and inexplicable disappearance—alludes to the Mary Celeste, a U.S. cargo ship which in December 1872 was found mysteriously abandoned in the North Atlantic
USA—1941 (slang of the Marines): a state of disorder or confusion—1959 (High-School slang): a prank in which the occupants of a vehicle which has temporarily come to a stop must jump out, run around the vehicle and get back in
USA, 1920—a system devised by the Red Cross Life Saving Corps for Boy Scout camps, whereby the boys were paired off, each boy in a pair staying with the other throughout a swimming period and taking responsibility for the other’s safety