Private eye

Origin

The concept of a private investigator emerged in the 19th century, with figures like Allan Pinkerton founding agencies to offer investigative services outside of official law enforcement. Pinkerton's agency, established in the 1850s, famously adopted an unblinking eye as its logo, alongside the motto 'We Never Sleep,' symbolizing constant vigilance. This iconic imagery likely contributed to the eventual coinage of 'private eye.' The term gained widespread popularity in the early 20th century, particularly through the gritty, hard-boiled detective fiction of authors like Dashiell Hammett and Raymond Chandler, who cemented the 'private eye' as a classic archetype in American culture.