Past tense of cameo: to appear briefly in a role or performance, usually as a special or surprise appearance.
From cameo (a small, distinctive role), which comes from Italian cammeo, referring to a carved gem or stone showing a profile or small image in relief. The theatrical sense developed in the 20th century.
Alfred Hitchcock became famous for his cameo appearances in his own movies—he trained audiences to spot him in the background, turning his signature into a kind of visual easter egg before the internet made finding hidden things cool.
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