From early 17th-century dialectal English *nudge* or *knidge*, meaning "to push gently." Possibly of Scandinavian origin, related to Norwegian *nugge* or *nyggje* ("to rub, push"). The figurative sense — encouraging someone subtly toward a decision — emerged later and became widely popularized by behavioral economists Richard Thaler and Cass Sunstein in their 2008 book *Nudge*, which gave the word a second life in policy and psychology discourse.

In behavioral economics and public policy, a "nudge" has become a technical term for any small design choice that steers people toward better decisions without restricting their freedom — think placing fruit at eye level in a cafeteria. The concept is now central to government policy units in the UK (the "Nudge Unit") and beyond, so English speakers may encounter the word in both casual conversation and academic or political contexts.