jack (3)EnglishOxford New American Dictionaryjack3 /jak, dʒæk / ▸ verb [with object] North American informal take (something) illicitly; steal: his MO in the studio remains the same—jack other people's tracks and present them in a new context. ▪ rob (someone): they jacked him for his car. – ORIGIN 1990s : from hijack.