The thumbs-down gesture in the painting is given by spectators at the Colosseum, including the Vestals, to the victorious murmillo, while the defeated retiarius raises two fingers to plead for mercy.
Pollice Verso (from Latin: with a turned thumb) is an 1872 painting by French artist Jean-Léon Gérôme, featuring the eponymous Roman gesture directed to the winning gladiator. 1872 painting by Jean-Léon Gérôme Pollice Verso