1975 as ‘French chef’s kiss’—a gesture used to indicate that something is excellent or perfect—also a perfect or excellent person or thing—alludes to such a gesture stereotypically made by a chef on tasting a delectable dish
a makeshift incendiary device for throwing by hand, consisting of a bottle filled with flammable liquid and with a piece of cloth as a fuse—Finland, 1940, in reference to Vyacheslav M. Molotov, who led the Soviet campaign against Finland
Canada, 1857: an angelic being imagined as being the source of a fall of snow—USA, 1893 (?): an impression in the snow resembling an angel, made by lying on one’s back and moving one’s arms and legs back and forth in an arc along the ground
1927 (translation of German ‘Hackordnung’): a dominance hierarchy, seen especially in domestic poultry, that is maintained by one bird pecking another of lower status—hence (1929): any hierarchy based on rank or status
USA, 1972—a chilling warning given to somebody—from Francis Ford Coppola’s The Godfather (1972), in which the severed head of a horse is left as a warning in a film producer’s bed
UK, 1806—‘to be able to sleep at night’: to be untroubled by the moral consequences of one’s actions, or by the risks and responsibilities of one’s situation