two-up adjective 1adverb 1noun 1two up verb 1forms 3 adjective1 •Having two document pages per printed page. adverb1 •With two people aboard.Some of us rode two-up as we travelled in convoy to the beach. noun1 •(Australia, New-Zealand) A game of chance, played by betting on the outcome of two pennies thrown in the air.From the image of a wily digger playing two-up, to a prime minister at the track or the tables, the construction of gambling is as an activity quintessentially Australian. — 1993 two up verb1 •(slang) To share a cell with someone in prison, especially in a one-person cell.Jerry is twoing up with Harrison. formstwoed up · twoing up · twos up