in baseball, "a low batting average," (somewhere around .200) with the suggestion that any player hitting below it ought to feel a bit ashamed, by 1984, said to have been in humorous use in baseball clubhouses c. 1979, from the name of former Pirate, Mariner, and Ranger shortstop Mario Mendoza, who was noted for his defense but whose .215 lifetime batting average routinely left him at the bottom of weekly batting averages. The surname is Basque.
by 1779, named for Charles Mason and Jeremiah Dixon, English astronomers who surveyed (1763-7) the disputed boundary between the colonial holdings of the Penns (Pennsylvania) and the Calverts (Maryland). It became the technical boundary between "free" and "slave" states after 1804, when the last slaveholding state above it (New Jersey) passed its abolition act. As the line between "the North" and "the South" in U.S. culture, it is attested by 1834.
early 15c., "conjuring tricks, sleight of hand," from Old French léger de main "quick of hand," literally "light of hand." Léger "light" in weight (Old French legier, 12c.) is from Latin levis "light" (from PIE root *legwh- "not heavy, having little weight"). It is cognate with Spanish ligero, Italian leggiero "light, nimble" (hence also leger line or ledger line in music). Main "hand" is from Latin manus (from PIE root *man- (2) "hand").
town and railroad stop on the Main Line outside Philadelphia, named 1869 by the Pennsylvania Railroad's executives, Welsh, literally "big hill;" it was the name of the estate near Dolgellau, Merionethshire, Wales, that belonged to Rowland Ellis, one of the original Quaker settlers in the region (1686). Before the change the village was known as Humphreysville, after another early Welsh settler. The women's college there was founded in 1885.