duff

"Duff" has a surprisingly lumpy history. It began in the kitchen as an old regional form of "dough," which gave English "plum duff," a heavy boiled pudding once common with sailors. From there, the word drifted into everyday speech and came to mean something poor, faulty, or useless. In modern British English, you might talk about a "duff battery" or "duff information" when something is not working or not trustworthy. The word also appears in a few other set uses, including the forest-floor sense and the phrase "up the duff."

The evolution of "duff" is a fascinating example of semantic drift—how a word's meaning shifts over centuries. In the 1800s, "duff" was simply a dialectal variant of "dough" (retaining the "f" sound found in words like rough or tough). It referred specifically to a stiff flour pudding boiled in a cloth bag. Because these puddings were frequently dense, leaden, and sometimes poorly made, the adjective "duff" began to take on the connotation of something of poor quality or worthless.

By the 20th century, the word had expanded its reach significantly. In British English, it became a common term for "broken" or "unreliable"—you might receive "duff information" or buy a "duff" piece of electronic equipment. Meanwhile, in North America, "duff" took on a different life as a slang term for the buttocks (as in "get off your duff"), likely referring to the "doughy" softness of one's seat. It also appears in the colorful idiom "up the duff," a common British and Australian way to say someone is pregnant.

The word also serves specialized roles in nature and sports. For foresters, "duff" refers to the thick layer of decaying organic matter on the forest floor. For golfers, to "duff" a shot is to mishit the ball clumsily, typically by hitting the ground behind it. Whether you are talking about a leaden dessert, a malfunctioning gadget, or a failed golf swing, "duff" remains a versatile, slightly old-fashioned way to describe anything that falls short of expectations.