ONE-UP Meaning of ONE-UP in English transcription, транскрипция: [ ˌwən-ˈəp, ˈwən- ]transitive verbEtymology: back-formation from one-upmanshipDate: 1963: to practice one-upmanship on Merriam-Webster's Collegiate English vocabulary. Энциклопедический словарь английского языка Merriam Webster. 2003