ski-bob 
noun
A device resembling a bicycle with skis instead of wheels, used for sliding down snow-covered slopes.Snow tends to interfere with the operation of the motor, which in the case of a ski-bob is often an air-cooled internal combustion engine, in several ways.
verb [no object]
Ride a ski-bob: (as noun ski-bobbing) the army included ski-bobbing in their own skiing championships...
- Henry has been ski-bobbing longer that he cares to remember and is a great ambassador for the sport.
- Apart from ski-bobbing during the day we spent many gourmet hours tasting and learning about Austrian food.
- In the winter, also popular are tobogganing, sleigh rides, ski-bobbing and curling.
Derivatives
ski-bobber
- At the top of the lift, the ski-bobber lets go of the handle, the hook opens and the t-bar is released.
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