(動詞) 去除某一產品多餘的功能使其恢復最原始或最基本的用途。譬如說,相對於智慧型手機 (smartphone),「愚笨型或非智慧型手機」(dumbphone) 只有撥打和接收電話以及收發簡訊的功能。
defeaturing (現在分詞/動名詞)

Defeaturing: The most important of these principles, which we called the process of “ditching the junk DNA”.
—Phanish Puranam & Nirmalya Kumar, “Elon Musk, Frugal Engineer,” Insead, June 9, 2015

Some of these new devices offer what Gardner calls “defeaturing”: a design that strips a product back to its original, traditional purpose.

The “dumbphone” is a perfect example. British designer Jasper Morrison recently launched the telephone in collaboration with Swiss tech company Punkt. The stripped-back mobile handset makes calls and accepts voice mail. That’s it.
—Laura Beeston, “How to be invisible: Designers create anti-surveillance products to protect privacy,” The Globe and Mail, October 14, 2015