Mountain biking is riding a rugged bicycle over rough ground. Go mountain biking, a mountain biking trail, mountain biking in the hills.
The sport began in California in the 1970s on modified old bicycles ridden down fire roads. Trail grading now works like ski runs, with green for easy and black for the ones that break collarbones.
1nounmountain bikingRiding a rugged bicycle over rough ground.
“We went mountain biking on the rocky trails above the lake.”
mountain biking is a sport.
Practised in Sports & Games Played, Cycling