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
French, 1848; English, 1861—a small, oblong cake made of choux pastry, filled with cream, and typically topped with chocolate icing—literally ‘lightning’—origin unknown
UK, 1935—jocular—is used by a man to defer his sexual duties to a wife or lover; is also applied to any postponement—translation of the earlier phrase ‘not tonight, Josephine’
USA & UK, 1995—to take a pregnancy test of a type involving urinating on a disposable plastic stick which immediately indicates the result—also, more generally: to take any of various other diagnostic tests of this type
a person exercising an insidious or corrupting influence, especially over a ruler, government, etc.—UK, 1917—refers to Grigori Efimovich Rasputin (circa 1869-1916), mystic and influential favourite at the court of Tsar Nicholas II
a term of abuse or disparagement, especially for a man’s wife or female relative—1616 in Epicœne, or The Silent Woman, by Ben Jonson—perhaps in reference to an encumbrance, like a clog (i.e., a heavy piece of wood) tied to a dog