Pollice verso or verso pollice is a Latin phrase, meaning "with a turned thumb", that is used in the context of gladiatorial combat. It refers to a hand gesture or thumb signal used by Ancient Roman crowds to pass judgment on a defeated gladiator following duels in colloseums. The precise gesture described by the phrase pollice verso, and its meaning, are the subject of scholarly debate. According to Anthony Corbeill, a classical studies professor who has extensively researched the practice, thumbs up signalled killing a gladiator, while "a closed fist with a wraparound thumb" meant sparing him. Zoologist Desmond Morris describes human gestures of this type to be culturally determined and transmitted.

Ancient Rome

The exact gesture described by the phrase pollice verso is unclear. From historical, archaeological, and literary records it is uncertain whether the thumb was turned up, turned down, held horizontally, or concealed inside the hand to indicate positive or negative opinions. Juvenal uses verso pollice in the Satires: Prudentius mentions the thumb gesture (converso pollice), used by a Vestal virgin who delights in the carnage:

In popular culture

The notion of the pollice verso thumb signal was brought to modern popular attention by an 1872 painting by French history painter Jean-Léon Gérôme entitled Pollice Verso (usually translated into English as Thumbs Down). It is a large canvas that depicts the Vestal Virgins signifying to a murmillo that they decree death on a fallen gladiator in the arena. The picture was purchased from Gérôme by U.S. department-store magnate Alexander Turney Stewart, who exhibited it in New York City, and it is now in the Phoenix Art Museum in Arizona. The painting almost immediately kicked off a controversy over the accuracy of Gerome's use of the thumbs-down gesture by spectators in the Colosseum. A 26-page pamphlet published in 1879, "Pollice Verso": To the Lovers of Truth in Classic Art, This is Most Respectfully Addressed, reprinted evidence for and against the accuracy of the painting, including a letter dated 8 December 1878 from Gérôme himself. Gérôme's painting greatly popularized the idea that thumbs up signaled life, and thumbs down signaled death, for a defeated gladiator. The gesture is used in many movies about Ancient Rome, including the 2000 film Gladiator, in which the Roman emperor Commodus uses a thumbs-up to spare the life of the film's hero, Maximus. Pollice Verso is also the title of a controversial 1904 drawing of the Crucifixion by Australian artist Norman Lindsay, depicting Christ being rejected by nude pagans.