what the butler sawWiktionary 原文词源说明Usually linked to the 1884 divorce trial of Gertrude Elizabeth Blood and Lord Colin Campbell, at which one key witness was a butler who claimed to have seen Lady Campbell's adultery through a keyhole.释义（英文）名词 Noun(UK, slang, often attributive) A story or film of titillating activity observed by voyeurism.(UK, chiefly attributive) A mutoscope; an amusement machine that shows a sequence of images or animation, often of a titillating nature, viewed via a peephole