偷天换日 tōutiānhuànrì to perpetrate a gigantic fraud Origin Definitions Defs Strokes Stroke Words Sentences Sents 偷 tōu adverb secretly secretly; stealthily; doing something behind people's backs without being noticed天 tiān noun sky sky; heavens; the space above the earth换 換 huàn verb to exchange to exchange; to trade; to switch; to convert currency日 rì noun sun (bound form) the sun; sunlight