mountain bike
US /ˈmaʊn.tɪn ˌbaɪk/
UK /ˈmaʊn.tɪn ˌbaɪk/

1.
VTT, vélo tout terrain
a bicycle with thick tires and a strong frame, designed for riding on rough terrain
:
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He rode his mountain bike down the steep trail.
Il a descendu le sentier escarpé avec son VTT.
•
She bought a new mountain bike for her adventures.
Elle a acheté un nouveau VTT pour ses aventures.