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
1599—a person with whom one chats, a partner in informal or friendly conversation—now, more specifically: a person with whom one communicates via online chat or messaging
people who meet for a short time, by chance, and then do not see each other again—people who, although living together, are unable to see very much of each other—coined in 1873 by the U.S. poet Henry Wadsworth Longfellow
in the phrases ‘(as) regular as pig tracks’ (1853) and ‘(as) common as pig tracks’ (1854), the plural noun ‘pig tracks’ is an intensifier—Southern United States