1. A game of chance, played by betting on the outcome of two pennies thrown in the air

1. Having two people riding on a motorcycle

Encyclopedia: Two-up

• underdress
• underdressed
• undereducated
• underemployed
• underemployment
• underestimate
• underestimation
• underevaluation
• underexpose
• underexposure
• underfed
• underfeed
• underfelt
• underfoot
• underframe
• underfur
• undergarment
• undergird
• underglaze
• undergo
• undergrad
• undergraduate
• underground
• underground press
• Underground Railroad