upwheel
/ˈʌpwil/Definitions
1. noun
A device on a bicycle that allows the rider to pedal backwards and use the bicycle as a push vehicle.
“The upwheel on the bicycle enabled her to easily move up the steep hill.”
2. verb
To move or propel something, especially a bicycle, by turning the pedals backwards.
“She upwheeled the bicycle and pushed it up the long hill.”