In disarray or confusion. The term comes from a game of dice in which throwing a six or seven has special significance, as it does in modern craps. There is considerable disagreement as to the precise game, or even if “six” or “seven” are not corruptions of sinque (five) and sice (six). Erasmus quoted a proverb to that effect, but, since dicing is very old indeed, the idea may be much older yet.

A yearning for change, specifically a change of sexual partner after seven years of marriage. This expression gained currency through George Axelrod’s play The Seven-Year Itch (1952), later made into a movie starring Marilyn Monroe (1955). Originally the phrase was used for various skin conditions. One such use was for poison ivy, in the belief that the rash would recur every year for seven years. Also, centuries ago itch was a slang word for “sexual desire.” Today, the expression invariably refers to the wish for a new sexual partner and, for some reason, tends to be applied only to men. Thus Patricia Moyes wrote, “There’s something called the seven-year itch . . . middle-aged men quite suddenly cutting loose” (Angel of Death, 1980).

Also 24/7. Indication that something—a store, a service, a person—is available at all times (twenty-four hours a day, seven days a week). Used since the second half of the 1900s, at first for shops that never close, the term was soon applied in numerous other contexts. For example, “I’m not looking to get a knife in my chest. I’ve got twenty-four/seven protection on me” (David Baldacci, Hour Game, 2004). A theater review by Ed Siegel in the Boston Globe (Feb. 1, 2005) also had it: “The younger generation. What are we to do with them, with their ‘whatever’ attitude, their irony, and their 24/7 access to sex, drugs, rock’n’roll, and the Internet?” See also whatever.